[ { "id": "https://thesis.library.caltech.edu/id/eprint/299", "eprint_id": 299, "rev_number": 9, "documents": [ { "id": "/id/document/451", "doc_id": 451, "rev_number": 3, "files": [ { "id": "/id/file/2872", "fileid": 2872, "datasetid": "document", "objectid": 451, "filename": "Bachman_da_1998.pdf", "mime_type": "application/pdf", "filesize": 21038203, "mtime": "2012-12-26 02:28:44", "url": "/299/1/Bachman_da_1998.pdf" } ], "eprint_id": 299, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "Bachman_da_1998.pdf", "language": "en", "security": "public", "license": "other", "main": "Bachman_da_1998.pdf", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "final", "relation": { "items": [ { "type": "http://eprints.org/relation/hasVolatileVersion", "uri": "/id/document/17277" }, { "type": "http://eprints.org/relation/haspreviewThumbnailVersion", "uri": "/id/document/17277" }, { "type": "http://eprints.org/relation/hasVersion", "uri": "/id/document/17277" } ] } }, { "id": "/id/document/17277", "doc_id": 17277, "rev_number": 3, "files": [ { "id": "/id/file/2870", "fileid": 2870, "datasetid": "document", "objectid": 17277, "filename": "preview.png", "mime_type": "image/png", "hash": "6da617352f1f722d62492e6c2edb8d45", "hash_type": "MD5", "filesize": 10236, "mtime": "2012-12-26 02:28:44", "url": "/299/2/preview.png" } ], "eprint_id": 299, "pos": 2, "placement": 2, "mime_type": "image/png", "format": "image/png", "language": "en", "security": "public", "license": "other", "main": "preview.png", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/451" }, { "type": "http://eprints.org/relation/ispreviewThumbnailVersionOf", "uri": "/id/document/451" }, { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/451" } ] } } ], "eprint_status": "archive", "userid": 2, "dir": "disk0/00/00/02/99", "datestamp": "2008-02-15", "lastmod": "2023-07-17 23:30:29", "status_changed": "2009-09-25 01:33:37", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Bachman-David-Alan", "name": { "family": "Bachman", "given": "David Alan" }, "show_email": "NO" } ] }, "title": "Nonlinear Phenomena in a Pure Electron Plasma Studied with a 2-D Fluid Code", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Applied Physics)", "abstract": "This thesis presents a new computational tool for studying cylindrical pure electron plasmas. Previous research used linear methods to describe the evolution of small plasma perturbations. This new tool numerically solves the nonlinear two- dimensional (2-D) fluid equations in cylindrical coordinates, allowing the exploration of many phenomena that have been observed experimentally in these plasmas. Most experimentally observed phenomena are large in amplitude and follow nonlinear dynamics. Clearly, codes based on the linearized equations can not reproduce these nonlinear phenomena.\r\n\r\nThe plasma was first studied for small amplitude perturbations using the nonlinear fluid code, producing results that agree with linearized calculations. The perturbed electric field decays in time, due to shear in the flow of density perturbations at different radii, which results in the total contribution to the perturbed electric field phase mixing away.\r\n\r\nAt higher amplitudes, the decay envelope becomes modulated, which is a result that has been observed experimentally and is also reproduced by this fluid code. The modulation is caused by nonlinear trapping of fluid elements within the wave, which is illustrated in images of the perturbed density.\r\n\r\nFor two applied pulses separated in time, a third echo response is observed after the responses to the two applied pulses have decayed away. Echoes have been observed experimentally in neutral plasmas, but have not yet been observed experimentally in non-neutral plasmas.\r\n\r\nAt very high amplitudes, a nonlinear decay instability occurs. A high amplitude wave decays into a wave with lower azimuthal symmetry number due to an interaction occurring at the beat frequency between the two waves. The beat-wave decay instability has been observed experimentally, and is also observed using the 2-D nonlinear fluid code.\r\n\r\nThe 2-D cylindrical nonlinear fluid code is capable of reproducing a wide range of non-neutral plasma phenomena, and is an important new tool for future research on non-neutral plasmas. This research is also relevant to ordinary fluids, since the equations describing a non-neutral plasma are analogous to the 2-D Euler equations for an inviscid fluid.", "date": "1998", "date_type": "degree", "id_number": "CaltechETD:etd-01232008-081243", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-01232008-081243", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Imported from ETD-db", "deposited_on": "2008-02-15", "doi": "10.7907/72z8-gm50", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "chair" }, { "id": "Corngold-N-R", "name": { "family": "Corngold", "given": "Noel Robert" }, "role": "member" }, { "id": "Bellan-P-M", "name": { "family": "Bellan", "given": "Paul Murray" }, "role": "member" } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2008-01-23", "thesis_defense_date": "1997-09-01", "thesis_approved_date": "2008-02-15", "review_status": "approved", "option_major": { "items": [ "appliedphys" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1998", "author_list": "Bachman, David Alan", "advisor_list": "Gould, Roy Walter", "comittee_list": "Gould, Roy Walter; Corngold, Noel Robert; et el." }, { "id": "https://thesis.library.caltech.edu/id/eprint/4051", "eprint_id": 4051, "rev_number": 11, "documents": [ { "id": "/id/document/6725", "doc_id": 6725, "rev_number": 3, "files": [ { "id": "/id/file/40708", "fileid": 40708, "datasetid": "document", "objectid": 6725, "filename": "Pillai_ns_1995.pdf", "mime_type": "application/pdf", "filesize": 3136416, "mtime": "2012-12-26 03:05:03", "url": "/4051/1/Pillai_ns_1995.pdf" } ], "eprint_id": 4051, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "Pillai_ns_1995.pdf", "language": "en", "security": "public", "license": "other", "main": "Pillai_ns_1995.pdf", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "final", "relation": { "items": [ { "type": "http://eprints.org/relation/hasVolatileVersion", "uri": "/id/document/23259" }, { "type": "http://eprints.org/relation/haspreviewThumbnailVersion", "uri": "/id/document/23259" }, { "type": "http://eprints.org/relation/hasVersion", "uri": "/id/document/23259" } ] } }, { "id": "/id/document/23259", "doc_id": 23259, "rev_number": 3, "files": [ { "id": "/id/file/40706", "fileid": 40706, "datasetid": "document", "objectid": 23259, "filename": "preview.png", "mime_type": "image/png", "hash": "d8c31186431c3e8058e1415249eace30", "hash_type": "MD5", "filesize": 10624, "mtime": "2012-12-26 03:05:03", "url": "/4051/2/preview.png" } ], "eprint_id": 4051, "pos": 2, "placement": 2, "mime_type": "image/png", "format": "image/png", "language": "en", "security": "public", "license": "other", "main": "preview.png", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/6725" }, { "type": "http://eprints.org/relation/ispreviewThumbnailVersionOf", "uri": "/id/document/6725" }, { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/6725" } ] } }, { "id": "/id/document/45900", "doc_id": 45900, "rev_number": 3, "files": [ { "id": "/id/file/134539", "fileid": 134539, "datasetid": "document", "objectid": 45900, "filename": "Pillai Thesis Permission Form.txt", "mime_type": "message/rfc822\\0117bit", "hash": "a0bd542b18927b9fe65a05f7dcebb93e", "hash_type": "MD5", "filesize": 725, "mtime": "2014-02-11 21:04:00", "url": "/4051/3/Pillai Thesis Permission Form.txt" } ], "eprint_id": 4051, "pos": 3, "placement": 3, "mime_type": "message/rfc822\\0117bit", "format": "text/plain", "format_desc": "author ok feb 2014", "language": "en", "security": "internal", "license": "other", "main": "Pillai Thesis Permission Form.txt", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "release" } ], "eprint_status": "archive", "userid": 2, "dir": "disk0/00/00/40/51", "datestamp": "2007-10-25", "lastmod": "2023-07-17 23:38:43", "status_changed": "2009-09-25 03:10:38", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "email": "sateeshpillai@gmail.com", "id": "Pillai-N-Sateesh", "name": { "family": "Pillai", "given": "N. Sateesh" }, "show_email": "YES" } ] }, "title": "Non-Dissipative Decay of Linear Quasimodes in a Pure Electron Plasma", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Electrical Engineering) ; Diocotron, quasimode, pure electron plasma", "abstract": "
This thesis describes the first experimental observations of linear collisionless damping of perturbations in a pure electron plasma and provides the theoretical proof for collisionless damping in two dimensional inviscid incompressible fluids. Observations in the non-linear regime provide evidence for fluid trapping in the potential well of the perturbation.
\r\n\r\nThe perturbations are in the form of diocotron waves which possess azimuthal symmetries described by the eigen number m = 2. The plasma is a cylindrical column of electrons confined in a Penning trap. Diocotron waves are excited by applying azimuthally propagating electric fields to the electrode structures forming the wall of the Penning trap.
\r\n\r\nExperiment shows that the damping of diocotron waves is not caused by dissipation at the electrode wall, and that the presence of such a dissipation decreases the decay rate of these waves, confirming that the m = 2 diocotron wave is a negative energy wave.
\r\n\r\nA self consistent set of equations for the perturbed potential is derived using the cold two dimensional fluid model. This results in the diocotron equation, which is the cylindrical plasma analog of Rayleigh's equation for shear flow of an inviscid incompressible fluid between parallel sheets. The complex form of the diocotron equation is solved, with homogeneous boundary conditions, for a particularly simple radial density profile showing that the diocotron resonances are quasimodes of the 2-D fluid. The solution reveals a complex eigenvalue which is consistent with the observed collisionless exponential damping of the diocotron wave in the linear regime.
\r\n\r\nSolution of the diocotron equation with more complicated density profiles is carried out numerically using the Runge-Kutta method on a computer.
\r\n", "date": "1995", "date_type": "degree", "id_number": "CaltechETD:etd-10122007-090003", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-10122007-090003", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Imported from ETD-db", "deposited_on": "2007-10-25", "doi": "10.7907/GHGX-Z547", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "chair" }, { "id": "Martel-H-C", "name": { "family": "Martel", "given": "Hardy Cross" }, "role": "member" }, { "id": "Corngold-N-R", "name": { "family": "Corngold", "given": "Noel Robert" }, "role": "member" } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2007-10-12", "thesis_defense_date": "1995-04-12", "thesis_approved_date": "2007-10-25", "review_status": "approved", "option_major": { "items": [ "eleceng" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1995", "author_list": "Pillai, N. Sateesh", "advisor_list": "Gould, Roy Walter", "comittee_list": "Gould, Roy Walter; Martel, Hardy Cross; et el." }, { "id": "https://thesis.library.caltech.edu/id/eprint/4583", "eprint_id": 4583, "rev_number": 9, "documents": [ { "id": "/id/document/7417", "doc_id": 7417, "rev_number": 3, "files": [ { "id": "/id/file/45315", "fileid": 45315, "datasetid": "document", "objectid": 7417, "filename": "Vu_hx_1990.pdf", "mime_type": "application/pdf", "filesize": 6895640, "mtime": "2012-12-26 03:09:59", "url": "/4583/1/Vu_hx_1990.pdf" } ], "eprint_id": 4583, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "Vu_hx_1990.pdf", "language": "en", "security": "public", "license": "other", "main": "Vu_hx_1990.pdf", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "final", "relation": { "items": [ { "type": "http://eprints.org/relation/hasVolatileVersion", "uri": "/id/document/23942" }, { "type": "http://eprints.org/relation/haspreviewThumbnailVersion", "uri": "/id/document/23942" }, { "type": "http://eprints.org/relation/hasVersion", "uri": "/id/document/23942" } ] } }, { "id": "/id/document/23942", "doc_id": 23942, "rev_number": 3, "files": [ { "id": "/id/file/45313", "fileid": 45313, "datasetid": "document", "objectid": 23942, "filename": "preview.png", "mime_type": "image/png", "hash": "533b8d4abf581ef7a6f2623216c9e649", "hash_type": "MD5", "filesize": 8535, "mtime": "2012-12-26 03:09:59", "url": "/4583/2/preview.png" } ], "eprint_id": 4583, "pos": 2, "placement": 2, "mime_type": "image/png", "format": "image/png", "language": "en", "security": "public", "license": "other", "main": "preview.png", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/7417" }, { "type": "http://eprints.org/relation/ispreviewThumbnailVersionOf", "uri": "/id/document/7417" }, { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/7417" } ] } } ], "eprint_status": "archive", "userid": 2, "dir": "disk0/00/00/45/83", "datestamp": "2007-12-06", "lastmod": "2023-07-17 23:24:04", "status_changed": "2009-09-25 03:21:23", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Vu-Hoanh-Xuan", "name": { "family": "Vu", "given": "Hoanh Xuan" }, "show_email": "NO" } ] }, "title": "Plasma Collection by an Obstacle", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Applied Physics)", "abstract": "The problem of plasma collection by an obstacle is investigated systematically to identify potentially important physical effects.\r\n\r\nIn the absence of an ambient toroidal plasma flow, plasma collection by a two-dimensional obstacle of half-width d extending to infinity in the y-direction (slab geometry) is studied in detail. The transport process is taken to be classical. The plasma is assumed to be strongly magnetized. The external magnetic field is assumed to be uniform, and is perpendicular to the obstacle's surface. Our numerical results suggest that both ion viscosity and ion viscous heating can be important in the regions where the ion velocity possesses sharp gradients, e.g., the region near the obstacle's tip.\r\n\r\nA two-dimensional, semi-empirical, model is proposed to account for the effect of anomalous transport due to a low-frequency, microscopic, electrostatic fluctuation of the poloidal electric field. The obstacle has a half-width of d, and is assumed to extend to infinity in the y-direction. The plasma is assumed to be strongly magnetized. The external magnetic field is assumed to be uniform, and is perpendicular to the obstacle's surface. In general, our proposed model suggests the following:\r\n\r\n1. Contrary to that which has been suggested in the literature, the cross-field ion viscosity coefficient (as well as the cross-field ion thermal conductivity) is not enhanced because the cross-field transport is dominated by the fluctuation induced convection.\r\n\r\n2. Viscous heating may have an important effect on the ion temperature when there exists a large velocity gradient. Furthermore, in the presence of anomalous transport, the physical mechanism by which viscous heating is generated is quite different from the case where the transport process is classical. In the absence of an ambient toroidal plasma flow, our numerical results suggest that for realistic plasma parameters, the peaked ion temperature is up to 85% higher than the ambient ion temperature due to ion viscous heating.\r\n\r\nA numerical code based on the above model is developed to deal with the case where the ambient toroidal plasma flow is finite. Such a situation arises in connection with experimental data obtained by the so-called Janus probe or Mach probe. Our numerical results indicate that near the obstacle's tip, the ions on the downstream side are hotter than those on the upstream side.", "date": "1990", "date_type": "degree", "id_number": "CaltechETD:etd-11152007-131939", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-11152007-131939", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Imported from ETD-db", "deposited_on": "2007-12-06", "doi": "10.7907/ctcn-eq94", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2007-11-15", "thesis_defense_date": "1990-05-17", "thesis_approved_date": "2007-12-06", "review_status": "approved", "option_major": { "items": [ "appliedphys" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1990", "author_list": "Vu, Hoanh Xuan", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/4494", "eprint_id": 4494, "rev_number": 18, "documents": [ { "id": "/id/document/93964", "doc_id": 93964, "rev_number": 4, "files": [ { "id": "/id/file/265430", "fileid": 265430, "datasetid": "document", "objectid": 93964, "filename": "Greene_gj_1984.pdf", "mime_type": "application/pdf", "hash": "db234b11428652159bdaf96946fe0d36", "hash_type": "MD5", "filesize": 18562245, "mtime": "2018-09-04 23:01:15", "url": "/4494/1/Greene_gj_1984.pdf" } ], "eprint_id": 4494, "pos": 1, "placement": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "Greene_gj_1984.pdf", "language": "en", "security": "public", "license": "other", 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"media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/93964" }, { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/93964" }, { "type": "http://eprints.org/relation/isIndexCodesVersionOf", "uri": "/id/document/93964" } ] } } ], "eprint_status": "archive", "userid": 2, "dir": "disk0/00/00/44/94", "datestamp": "2005-11-10", "lastmod": "2023-07-17 23:35:35", "status_changed": "2009-09-25 03:19:34", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Greene-Glenn-Joel", "name": { "family": "Greene", "given": "Glenn Joel" }, "show_email": "NO" } ] }, "title": "ICRF Antenna Coupling and Wave Propagation in a Tokamak Plasma", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Applied Physics)", "abstract": "A variety of experiments are reported pertaining to the excitation, propagation, and damping of waves in the ion cyclotron range of frequencies (ICRF) in the Caltech Research Tokamak.
\r\n\r\nComplex impedance studies on five different RF antennas addressed the nature of the anomalous density-dependent background loading observed previously in several laboratories. A model was proposed which successfully explained many of the observed impedance characteristics solely in terms of particle collection and rectification through the plasma sheath surrounding the antenna electrode. Peaks were observed on the input resistance of the shielded antennas and were coincident with toroidal eigenmode production; their magnitude was explained by a simple coupling theory.
\r\n\r\nThe toroidal eigenmodes were studied in detail with magnetic field probes. The mode dispersion curves in density-frequency space were mapped out and the results compared with various theoretical models. A surprising result was that all of the antennas, both magnetic and electric in nature, coupled to the eigenmodes with comparable efficiency with respect to the antenna excitation current. Wave damping was investigated and found to be considerably higher than predicted by a variety of physical mechanisms. A numerical model of the wave equations permitting an arbitrary radial density profile was developed, and a possible mechanism for enhanced cyclotron damping due to density perturbations was proposed. Toroidal modes were identified using phase measurements between pairs of magnetic probes; they were found to have m = 1 poloidal character and low integral toroidal mode numbers, in accordance with theoretical predictions.
\r\n\r\nA new approach to the study of ICRF wave propagation was investigated: wave-packets were launched and their propagation was followed around the tokamak using magnetic probes. This technique avoided the dominant effect of the eigenmode resonances because it observed propagation on a time scale short compared to the formation time for the modes. The transit time of the packets around the machine yielded the toroidal group velocity, and the results of the experiments were compared with several theoretical models. The inclusion of a vacuum layer at the plasma edge was useful in explaining some of the observations.
\r\n\r\nFinally, a plasma-compatible Rogowski current probe was developed and used to observe, for the first time, RF particle current in a tokamak plasma. The diagnostic permitted investigation of the spatial form of the RF current driven in the edge plasma by the electric field antennas. The results dramatically showed that the current from these antennas flows largely along the toroidal field lines. This highly localized current distribution suggests a mechanism for the good coupling to the eigenmode fields observed with these antennas.
", "date": "1984", "date_type": "degree", "id_number": "CaltechETD:etd-11102005-144119", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-11102005-144119", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Westinghouse Electric" }, { "agency": "Earle C. Anthony Foundation" }, { "agency": "Rockwell" }, { "agency": "Department of Energy (DOE)", "grant_number": "DE-AS03-76SF-00767" } ] }, "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Imported from ETD-db", "deposited_on": "2005-11-10", "doi": "10.7907/ppan-gp26", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "email": "rwgould@caltech.edu", "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "email": "rwgould@caltech.edu", "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "chair" }, { "email": "pbellan@caltech.edu", "id": "Bellan-P-M", "name": { "family": "Bellan", "given": "Paul Murray" }, "orcid": "0000-0002-0886-8782", "role": "member" }, { "email": "nrdc@caltech.edu", "id": "Corngold-N-R", "name": { "family": "Corngold", "given": "Noel Robert" }, "role": "member" }, { "email": "w6fa@caltech.edu", "id": "Bridges-W-B", "name": { "family": "Bridges", "given": "William B." }, "role": "member" }, { "email": "tgp@submm.caltech.edu", "id": "Phillips-T-G", "name": { "family": "Phillips", "given": "Thomas G." }, "role": "member" } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2005-11-10", "thesis_defense_date": "1984-02-09", "thesis_approved_date": "2005-11-10", "review_status": "approved", "option_major": { "items": [ "appliedphys" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1984", "author_list": "Greene, Glenn Joel", "advisor_list": "Gould, Roy Walter", "comittee_list": "Gould, Roy Walter; Bellan, Paul Murray; et el." }, { "id": "https://thesis.library.caltech.edu/id/eprint/3523", "eprint_id": 3523, "rev_number": 18, "documents": [ { "id": "/id/document/6086", "doc_id": 6086, "rev_number": 3, "files": [ { "id": "/id/file/36326", "fileid": 36326, "datasetid": "document", "objectid": 6086, "filename": "Hedeman_ma_1982.pdf", "mime_type": "application/pdf", "filesize": 6187716, "mtime": "2012-12-26 03:00:40", "url": "/3523/1/Hedeman_ma_1982.pdf" } ], "eprint_id": 3523, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "Original (no OCR) Hedeman_ma_1982.pdf", "language": "en", "security": "internal", "license": "other", "main": "Hedeman_ma_1982.pdf", 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research tokamak plasma has been performed. The fluctuations were measured with movable probes inserted directly into the plasma. Estimates of the fluctuating field strength, power spectral density, and correlation lengths have been made by calculations on the raw data. The fluctuations were found to be of comparable strength for the radial and poloidal components, while the toroidal component was found to be at least a factor of 5 weaker in strength. The fluctuating field strength showed no apparent dependence on plasma current and safety factor at the edge, but increased with electron density during gas puffing and as the minor radius of measurement was decreased.
\r\n\r\nThe power spectral density indicated that the fluctuations could be divided into two frequency regions. The low frequency region (f < 100 kHz) was dominated by coherent MHD modes with correlation lengths on the order of the tokamak size. The high frequency (f > 100 kHz) region appeared to be turbulent in nature with short correlation lengths in the poloidal direction (< .01 m), but longer correlation lengths in the radial direction (> .04 m). The high frequency region showed a roll-off in frequency of \u03b4Br of approximately f-2.5.
\r\n\r\nThe results are compared with theories of fluctuation sources and the effects of fluctuations on anomalous electron thermal transport. The best fit to the high frequency region spectral density is given by a statistical theory of fluctuations. The fluctuating field strength appears to be more than an order of magnitude too small to account for the anomalous electron thermal transport using stochastic field theory.
", "date": "1982", "date_type": "degree", "id_number": "CaltechETD:etd-09132006-153307", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-09132006-153307", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Melissa Ray", "deposited_by": "Imported from ETD-db", "deposited_on": "2006-09-29", "doi": "10.7907/z70q-f715", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "email": "rwgould@caltech.edu", "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "email": "rwgould@caltech.edu", "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "chair" }, { "email": "pbellan@caltech.edu", "id": "Bellan-P-M", "name": { "family": "Bellan", "given": "Paul Murray" }, "orcid": "0000-0002-0886-8782", "role": "member" }, { "email": "w6fa@caltech.edu", "id": "Bridges-W-B", "name": { "family": "Bridges", "given": "William B." }, "role": "member" }, { "email": "rutledge@caltech.edu", "id": "Rutledge-D-B", "name": { "family": "Rutledge", "given": "David B." }, "role": "member" }, { "id": "Saffman-P-G", "name": { "family": "Saffman", "given": "Philip G." }, "role": "member" } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2006-09-13", "thesis_defense_date": "1981-07-28", "thesis_approved_date": "2006-09-29", "review_status": "approved", "option_major": { "items": [ "appliedphys" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1982", "author_list": "Hedemann, Mark Allen", "advisor_list": "Gould, Roy Walter", "comittee_list": "Gould, Roy Walter; Bellan, Paul Murray; et el." }, { "id": "https://thesis.library.caltech.edu/id/eprint/4018", "eprint_id": 4018, "rev_number": 8, "documents": [ { "id": "/id/document/6686", "doc_id": 6686, "rev_number": 3, "files": [ { "id": "/id/file/40436", "fileid": 40436, "datasetid": "document", "objectid": 6686, "filename": "Levine_bs_1980.pdf", "mime_type": "application/pdf", "filesize": 17688917, "mtime": "2012-12-26 03:04:47", "url": "/4018/1/Levine_bs_1980.pdf" } ], "eprint_id": 4018, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "Levine_bs_1980.pdf", "language": "en", "security": "public", "license": "other", "main": "Levine_bs_1980.pdf", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "final", "relation": { "items": [ { "type": "http://eprints.org/relation/hasVolatileVersion", "uri": "/id/document/23220" }, { "type": "http://eprints.org/relation/haspreviewThumbnailVersion", "uri": "/id/document/23220" }, { "type": "http://eprints.org/relation/hasVersion", "uri": "/id/document/23220" } ] } }, { "id": "/id/document/23220", "doc_id": 23220, "rev_number": 3, "files": [ { "id": "/id/file/40434", "fileid": 40434, "datasetid": "document", "objectid": 23220, "filename": "preview.png", "mime_type": "image/png", "hash": "760ad94dbce9e20f4f4cc2ef377fb638", "hash_type": "MD5", "filesize": 9119, "mtime": "2012-12-26 03:04:47", "url": "/4018/2/preview.png" } ], "eprint_id": 4018, "pos": 2, "placement": 2, "mime_type": "image/png", "format": "image/png", "language": "en", "security": "public", "license": "other", "main": "preview.png", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/6686" }, { "type": "http://eprints.org/relation/ispreviewThumbnailVersionOf", "uri": "/id/document/6686" }, { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/6686" } ] } } ], "eprint_status": "archive", "userid": 2, "dir": "disk0/00/00/40/18", "datestamp": "2006-10-27", "lastmod": "2021-04-19 22:39:27", "status_changed": "2009-09-25 03:09:52", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Levine-B-S", "name": { "family": "Levine", "given": "Bruce Stephen" }, "show_email": "NO" } ] }, "title": "Particle confinement and magnetic fluctuations in tokamak discharges with gas puffing", "ispublished": "unpub", "full_text_status": "public", "abstract": "An experimental investigation has been made of particle confinement and magnetic fluctuations associated with short (< 1 msec) gas pulses into a Tokamak discharge. The fluctuations are measured with movable pairs of magnetic probes, each containing a poloidal and radial coil and inserted into the outer regions of the plasma.\n\nWhen neutral gas is added and the current channel contracts, the fluctuation spectra are dominated by an m=2 mode that grows with the classical tearing-mode rate. When the gas feed is terminated, much broader spectra of modes with m up to 15 are observed. The modal frequencies are nearly integer multiples of 11 kHz. The m=2 mode dominates the poloidal spectra, while the radial spectra have numerous modes of appreciable amplitude. Time-delay measurements suggest that many of the higher-order (m > 3) modes originate in deformation of the m=2 and m=3 magnetic islands. A strong m=7 is found to be localized near the limiter in q(a) = 3.8 discharges, hence this mode is identified as an m=7, n=2, It is found that the m=2 mode becomes destabilized for discharges for which the peak puff density approaches the upper limit given by the Murakami scaling relation. The m=2 mode grows at a rate much slower than the classical tearing-mode rate. The threshold in peak puff density for this destabilization coincides with a degradation in particle confinement.", "date": "1980", "date_type": "degree", "id_number": "CaltechETD:etd-10102006-132249", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-10102006-132249", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "deposited_by": "Imported from ETD-db", "deposited_on": "2006-10-27", "doi": "10.7907/rrs7-xm92", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2006-10-10", "thesis_defense_date": "1980-05-08", "thesis_approved_date": "2006-10-27", "review_status": "approved", "option_major": { "items": [ "eleceng" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1980", "author_list": "Levine, Bruce Stephen", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/8562", "eprint_id": 8562, "rev_number": 16, "documents": [ { "id": "/id/document/50969", "doc_id": 50969, "rev_number": 4, "files": [ { "id": "/id/file/147536", "fileid": 147536, "datasetid": "document", "objectid": 50969, "filename": "HWANG_DLSQ_1979.pdf", "mime_type": "application/pdf", "hash": "dc090d70502a0130caf5d887d977a701", "hash_type": "MD5", "filesize": 34325827, "mtime": "2014-07-18 18:00:53", "url": "/8562/1/HWANG_DLSQ_1979.pdf" } ], "eprint_id": 8562, "pos": 1, "placement": 1, "mime_type": "application/pdf", "format": "application/pdf", "language": "en", "security": "public", "license": "other", "main": 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"http://eprints.org/relation/isIndexCodesVersionOf", "uri": "/id/document/50969" } ] } } ], "eprint_status": "archive", "userid": 1660, "dir": "disk0/00/00/85/62", "datestamp": "2014-07-18 18:23:26", "lastmod": "2022-11-09 19:20:08", "status_changed": "2014-07-18 18:23:26", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Hwang-David-Li-Shui-Quek", "name": { "family": "Hwang", "given": "David Li-Shui Quek" }, "show_email": "NO" } ] }, "title": "Propagation of the fast magnetosonic wave in a tokamak plasma", "ispublished": "unpub", "full_text_status": "public", "keywords": "Applied Physics", "abstract": "The propagation of the fast magnetosonic wave in a tokamak\r\nplasma has been investigated at low power, between 10 and 300 watts,\r\nas a prelude to future heating experiments.
\r\n\r\nThe attention of the experiments has been focused on the understanding\r\nof the coupling between a loop antenna and a plasma-filled\r\ncavity. Special emphasis has been given to the measurement of the complex\r\nloading impedance of the plasma. The importance of this measurement\r\nis that once the complex loading impedance of the plasma is known,\r\na matching network can be designed so that the r.f. generator impedance\r\ncan be matched to one of the cavity modes, thus delivering maximum\r\npower to the plasma. For future heating experiments it will be essential\r\nto be able to match the generator impedance to a cavity mode in\r\norder to couple the r.f. energy efficiently to the plasma.
\r\n\r\nAs a consequence of the complex impedance measurements, it was\r\ndiscovered that the designs of the transmitting antenna and the impedance\r\nmatching network are both crucial. The losses in the antenna and\r\nthe matching network must be kept below the plasma loading in order to\r\nbe able to detect the complex plasma loading impedance. This is even\r\nmore important in future heating experiments, because the fundamental\r\nbasis for efficient heating before any other consideration is to deliver\r\nmore energy into the plasma than is dissipated in the antenna system.
\r\n\r\nThe characteristics of the magnetosonic cavity modes are confirmed\r\nby three different methods. First, the cavity modes are observed\r\nas voltage maxima at the output of a six-turn receiving probe.\r\nSecond, they also appear as maxima in the input resistance of the transmitting\r\nantenna. Finally, when the real and imaginary parts of the\r\nmeasured complex input impedance of the antenna are plotted in the\r\ncomplex impedance plane, the resulting curves are approximately circles,\r\nindicating a resonance phenomenon.
\r\n\r\nThe observed plasma loading resistances at the various cavity\r\nmodes are as high as 3 to 4 times the basic antenna resistance (~ .4 \u2126).\r\nThe estimated cavity Q\u2019s were between 400 and 700. This means that\r\nefficient energy coupling into the tokamak and low losses in the antenna\r\nsystem are possible.
", "date": "1979", "date_type": "degree", "id_number": "CaltechTHESIS:07182014-104710068", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechTHESIS:07182014-104710068", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Tony Diaz", "deposited_by": "Bianca Rios", "deposited_on": "2014-07-18 18:23:26", "doi": "10.7907/f15y-jy67", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_defense_date": "1978-06-15", "review_status": "approved", "option_major": { "items": [ "appliedphys" ] }, "copyright_statement": "Author's Rights Authorization: I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted here is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive license to archive and make accessible, under the conditions specified under \"Thesis Availability\" in this submission, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation, or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1979", "author_list": "Hwang, David Li-Shui Quek", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/8591", "eprint_id": 8591, "rev_number": 19, "documents": [ { "id": "/id/document/51165", "doc_id": 51165, "rev_number": 3, "files": [ { "id": "/id/file/148146", "fileid": 148146, "datasetid": "document", "objectid": 51165, "filename": "Kubena_rl_1978.pdf", "mime_type": "application/pdf", "hash": "787e6b0c78c10877b00adf28acf97f99", "hash_type": "MD5", "filesize": 14398198, "mtime": "2014-07-22 22:50:22", "url": "/8591/1/Kubena_rl_1978.pdf" } ], "eprint_id": 8591, "pos": 1, "placement": 1, "mime_type": "application/pdf", "format": "application/pdf", "language": "en", "security": "public", "license": "other", "main": 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"/id/document/51165" } ] } }, { "id": "/id/document/129265", "doc_id": 129265, "rev_number": 1, "files": [ { "id": "/id/file/374701", "fileid": 374701, "datasetid": "document", "objectid": 129265, "filename": "indexcodes.txt", "mime_type": "text/plain", "hash": "31325ac776acec789e1298185158f5da", "hash_type": "MD5", "filesize": 19093, "mtime": "2021-06-24 03:38:48", "url": "/8591/7/indexcodes.txt" } ], "eprint_id": 8591, "pos": 7, "placement": 7, "mime_type": "text/plain", "format": "other", "format_desc": "Generate index codes conversion from application/pdf to indexcodes", "language": "en", "security": "public", "license": "other", "main": "indexcodes.txt", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/51165" }, { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/51165" }, { "type": "http://eprints.org/relation/isIndexCodesVersionOf", "uri": "/id/document/51165" } ] } } ], "eprint_status": "archive", "userid": 87, "dir": "disk0/00/00/85/91", "datestamp": "2014-07-23 17:04:25", "lastmod": "2021-04-19 22:29:20", "status_changed": "2014-07-23 17:04:25", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Kubena-R-L", "name": { "family": "Kubena", "given": "Randall Lynn" } } ] }, "title": "Fluctuations in a tokamak plasma", "ispublished": "unpub", "full_text_status": "public", "keywords": "Applied Physics ; tokamak plasma", "abstract": "An experimental investigation of low frequency floating potential fluctuations (f \u2264 200 kHz) in a research tokamak plasma using two spatially separated electrostatic probes has been performed. The spectra, correlation length, and the phase velocity of the fluctuations in both the radial and azimuthal direction have been determined. The propagation velocity in the toroidal direction was also measured and was found to be in the direction of electron current flow. The waves traveled azimuthally\r\nin the ion diamagnetic drift direction, even after the usual E x B rotation was taken into account. The electron density fluctuations associated with these oscillations were large, \u03b4n/n \u2243 0.35 - 0.50.
\r\n\r\nThe spectra were found to have regularly spaced peaks which seemed\r\nto be related to specific azimuthal modes (m =1,2,3,...,etc. ) A parametric\r\nstudy was made to determine what effect plasma parameters had on\r\nthese peaks. During periods of high electron density in the first 2 msec\r\nof the plasma lifetime, strong sawtooth type oscillations were observed.\r\nThese oscillations typically had frequencies of approximately 10 kHz and\r\nwere also present when large amounts of neutral gas were added during the\r\ndischarge by a process called \"gas puffing.\"
\r\n\r\nThe results are compared with experimental observations made on\r\nother plasma devices with electric and magnetic probes and with microwave\r\nand CO2 laser scattering techniques. (The scattering measurements are\r\ncomplimentary to the probe measurements since, in the former case, the\r\nwavelength is fixed by the scattering angle, but the oscillations could\r\nnot be spatially localized.) The oscillations in the Caltech torus were\r\nprobably related to a drift-tearing type instability which is thought\r\nto play a major role in the anomalous particle and energy flux observed\r\nin tokamaks. Comparisons are made between current theory and the experimental\r\nresults. However, the theory for the observed oscillations\r\nis still in a rudimentary stage of development, and it is hoped that\r\nthe present investigation will stimulate future analytical work.
", "date": "1978", "date_type": "degree", "id_number": "CaltechTHESIS:07222014-154820206", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechTHESIS:07222014-154820206", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Benjamin Perez", "deposited_on": "2014-07-23 17:04:25", "doi": "10.7907/ncb6-bs51", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" } } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_defense_date": "1978-02-17", "review_status": "approved", "option_major": { "items": [ "appliedphys" ] }, "copyright_statement": "Author's Rights Authorization: I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted here is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive license to archive and make accessible, under the conditions specified under \"Thesis Availability\" in this submission, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation, or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1978", "author_list": "Kubena, Randall Lynn", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/8557", "eprint_id": 8557, "rev_number": 20, "documents": [ { "id": "/id/document/50933", "doc_id": 50933, "rev_number": 3, "files": [ { "id": "/id/file/147425", "fileid": 147425, "datasetid": "document", "objectid": 50933, "filename": "Grabble_cl_1978.zip", "mime_type": "application/x-zip", "hash": "a76b7124f3e7204e89d0b768d7d4a948", "hash_type": "MD5", "filesize": 146828600, "mtime": "2014-07-18 15:00:50", "url": "/8557/6/Grabble_cl_1978.zip" } ], "eprint_id": 8557, "pos": 6, "placement": 6, "mime_type": "application/x-zip", "format": "application/zip", "format_desc": "TIFF", "language": "en", "security": "internal", "license": "other", 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"http://eprints.org/relation/isIndexCodesVersionOf", "uri": "/id/document/50935" } ] } } ], "eprint_status": "archive", "userid": 87, "dir": "disk0/00/00/85/57", "datestamp": "2014-07-18 15:19:18", "lastmod": "2020-02-07 19:39:38", "status_changed": "2014-07-18 15:19:18", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Grabbe-Crockett-Lane", "name": { "family": "Grabbe", "given": "Crockett Lane" }, "show_email": "NO" } ] }, "title": "Resonance Cones and Mode Conversion in a Warm Magnetized Bounded Plasma", "ispublished": "unpub", "full_text_status": "public", "keywords": "Applied Physics ", "abstract": "The warm plasma resonance cone structure of the quasistatic field\r\nproduced by a gap source in a bounded magnetized slab plasma is\r\ndetermined theoretically. This is initially determined for a homogeneous\r\nor mildly inhomogeneous plasma with source frequency lying\r\nbetween the lower hybrid frequency and the plasma frequency. It\r\nis then extended to the complicated case of an inhomogeneous plasma\r\nwith two internal lower hybrid layers present, which is of interest\r\nto radio frequency heating of plasmas.
\r\n\r\nIn the first case, the potential is obtained as a sum of multiply\r\nreflected warm plasma resonance cones, each of which has a similar\r\nstructure, but a different size, amplitude, and position. An\r\nimportant interference between nearby multiply-reflected resonance\r\ncones is found. The cones are seen to spread out as they move\r\naway from the source, so that this interference increases and the\r\nindividual resonance cones become obscured far away from the source.
\r\n\r\nIn the second case, the potential is found to be expressible as\r\na sum of multiply-reflected, multiply-tunnelled, and mode converted\r\nresonance cones, each of which has a unique but similar structure.\r\nThe effects of both collisional and collisionless damping are included\r\nand their effects on the decay of the cone structure studied.\r\nVarious properties of the cones such as how they move into and out\r\nof the hybrid layers, through the evanescent region, and transform\r\nat the hybrid layers are determined. It is found that cones can\r\ntunnel through the evanescent layer if the layer is thin,\r\nand the effect of the thin evanescent layer is to subdue the\r\nsecondary maxima of cone relative to the main peak, while slightly\r\nbroadening the main peak and shifting it closer to the cold plasma\r\ncone line.
\r\n\r\nEnergy theorems for quasistatic fields are developed and applied\r\nto determine the power flow and absorption along the individual\r\ncones. This reveals the points of concentration of the flow and the\r\nvarious absorption mechanisms.
", "date": "1978", "date_type": "degree", "id_number": "CaltechTHESIS:07182014-075841435", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechTHESIS:07182014-075841435", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Tony Diaz", "deposited_by": "Benjamin Perez", "deposited_on": "2014-07-18 15:19:18", "doi": "10.7907/BY3Z-2M41", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_defense_date": "1977-08-29", "review_status": "approved", "option_major": { "items": [ "appliedphys" ] }, "copyright_statement": "Author's Rights Authorization: I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted here is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive license to archive and make accessible, under the conditions specified under \"Thesis Availability\" in this submission, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation, or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1978", "author_list": "Grabbe, Crockett Lane", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/8596", "eprint_id": 8596, "rev_number": 16, "documents": [ { "id": "/id/document/51200", "doc_id": 51200, "rev_number": 2, "files": [ { "id": "/id/file/148258", "fileid": 148258, "datasetid": "document", "objectid": 51200, "filename": "Wilgen-jb-1975.pdf", "mime_type": "application/pdf", "hash": "e89a1de75ce5635732d82d595c35b448", "hash_type": "MD5", "filesize": 34290404, "mtime": "2014-07-23 21:29:44", "url": "/8596/1/Wilgen-jb-1975.pdf" } ], "eprint_id": 8596, "pos": 1, "placement": 1, "mime_type": "application/pdf", "format": "application/pdf", "language": "en", "security": "public", "license": "other", "main": "Wilgen-jb-1975.pdf", 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"http://eprints.org/relation/isIndexCodesVersionOf", "uri": "/id/document/51200" } ] } } ], "eprint_status": "archive", "userid": 104, "dir": "disk0/00/00/85/96", "datestamp": "2014-07-23 21:38:32", "lastmod": "2022-11-09 19:20:12", "status_changed": "2014-07-23 21:38:32", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Wilgen-J-B", "name": { "family": "Wilgen", "given": "John B." }, "show_email": "NO" } ] }, "title": "Cyclotron harmonic emission in a Penning discharge", "ispublished": "unpub", "full_text_status": "public", "keywords": "Electrical Engineering, Cyclotron harmonic, emission, Penning discharge", "abstract": "Microwave noise emission at the harmonics of the electron cyclotron frequency from the magnetized plasma column of a Penning discharge is investigated experimentally. The harmonic emission spectrum is observed using oxygen gas in a variety of discharge configurations. It is found that grid stabilization of the plasma\r\ncolumn has very little effect on the emission spectrum. Measurements of the shape and location of the harmonic emission lines are described in detail. On the basis of a microwave interferometer measurement of the electron density, it is concluded that the existence of a hybrid layer somewhere on the plasma column is a necessary condition for the observation of harmonic emission. The\r\nrelaxation time and the cathode voltage dependence of the harmonic emission are investigated using a pulse modulation technique. It is found that the emission intensity increases rapidly with the magnitude of the cathode voltage and that the relaxation time decreases with increasing neutral gas pressure. High intensity nonharmonic radiation is observed and identified as resulting from a beam-plasma wave\r\ninstability thereby eliminating the same instability as a possible source of the harmonic emission. It is found that the collective experimental results are in reasonable agreement with the single particle electrostatic radiation theory of Canobbio and Croci.
\r\n", "date": "1975", "date_type": "degree", "id_number": "CaltechTHESIS:07232014-141900755", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechTHESIS:07232014-141900755", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Tony Diaz", "deposited_by": "Dan Anguka", "deposited_on": "2014-07-23 21:38:32", "doi": "10.7907/0Y87-V047", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_defense_date": "1975-04-09", "review_status": "approved", "option_major": { "items": [ "eleceng" ] }, "copyright_statement": "Author's Rights Authorization: I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted here is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive license to archive and make accessible, under the conditions specified under \"Thesis Availability\" in this submission, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation, or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1975", "author_list": "Wilgen, John B.", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/4252", "eprint_id": 4252, "rev_number": 7, "documents": [ { "id": "/id/document/6992", "doc_id": 6992, "rev_number": 2, "files": [ { "id": "/id/file/42477", "fileid": 42477, "datasetid": "document", "objectid": 6992, "filename": "Burrell_kh_1974.pdf", "mime_type": "application/pdf", "filesize": 7171963, "mtime": "2012-12-26 03:06:56", "url": "/4252/1/Burrell_kh_1974.pdf" } ], "eprint_id": 4252, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "Burrell_kh_1974.pdf", "language": "en", "security": "public", "license": "other", "main": "Burrell_kh_1974.pdf", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "final", "relation": { "items": [ { "type": "http://eprints.org/relation/hasVolatileVersion", "uri": "/id/document/23522" }, { "type": "http://eprints.org/relation/haspreviewThumbnailVersion", "uri": "/id/document/23522" }, { "type": "http://eprints.org/relation/hasVersion", "uri": "/id/document/23522" } ] } }, { "id": "/id/document/23522", "doc_id": 23522, "rev_number": 2, "files": [ { "id": "/id/file/42475", "fileid": 42475, "datasetid": "document", "objectid": 23522, "filename": "preview.png", "mime_type": "image/png", "hash": "7e5cf8557eeb1c462863b1eb14c1a13e", "hash_type": "MD5", "filesize": 9160, "mtime": "2012-12-26 03:06:56", "url": "/4252/2/preview.png" } ], "eprint_id": 4252, "pos": 2, "placement": 2, "mime_type": "image/png", "format": "image/png", "language": "en", "security": "public", "license": "other", "main": "preview.png", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/6992" }, { "type": "http://eprints.org/relation/ispreviewThumbnailVersionOf", "uri": "/id/document/6992" }, { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/6992" } ] } } ], "eprint_status": "archive", "userid": 2, "dir": "disk0/00/00/42/52", "datestamp": "2005-10-25", "lastmod": "2019-12-21 03:54:09", "status_changed": "2009-09-25 03:14:54", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Burrell-K-H", "name": { "family": "Burrell", "given": "Keith Howard" }, "show_email": "NO" } ] }, "title": "An investigation of the resonance cone structure in a warm anisotropic plasma", "ispublished": "unpub", "full_text_status": "public", "abstract": "NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.\n\nThis work presents a detailed theoretical and experimental investigation of the resonance cone pattern excited by a small antenna in a warm, magnetized plasma.\n\nThe warm plasma theory is developed for an infinite, uniform plasma for arbitrary incident frequency [...] in the limit that [...] and [...]. Here, [...] and [...] are the electron plasma and cyclotron frequencies, respectively, while [...] is the Debye length, [...] is the Larmor radius, and [...] is the distance from the source to the point of observation. The theory predicts the functional dependence of the angular position of the main resonance cone peak and the angular spacing between interference peaks on the physical parameters. The theory for plasmas with nonuniform density is also developed, but in the cold plasma limit, leading to predictions that the resonance cones can reflect off of density gradients.\n\nExperimental work verifying the theoretical picture is presented. The main cone angle is found to depend on [...], [...], [...], and [...] in a manner consistent with the theory, as is the angular interference spacing. The idea of resonance cones reflecting from density gradients can explain features of the data that are otherwise incomprehensible.\n\nFrom the data, values for [...] are obtained in two independent ways, and the results are consistent. The data also yield a value for the temperature that is appropriate for the afterglow plasma used in the experiment. Since both density and temperature can be obtained from the same data, resonance cone measurements are a useful diagnostic for plasmas in which antennas can be inserted.", "date": "1974", "date_type": "degree", "id_number": "CaltechETD:etd-10252005-155445", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-10252005-155445", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "deposited_by": "Imported from ETD-db", "deposited_on": "2005-10-25", "doi": "10.7907/HD16-SA13", "divisions": { "items": [ "div_pma" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2005-10-25", "thesis_defense_date": "1974-05-28", "thesis_approved_date": "2005-10-25", "review_status": "approved", "option_major": { "items": [ "physics" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1974", "author_list": "Burrell, Keith Howard", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/8588", "eprint_id": 8588, "rev_number": 17, "documents": [ { "id": "/id/document/51157", "doc_id": 51157, "rev_number": 3, "files": [ { "id": "/id/file/148113", "fileid": 148113, "datasetid": "document", "objectid": 51157, "filename": "Moeller_cp_1973.zip", "mime_type": "application/x-zip", "hash": "790d7ab1e902019c75d3894d073e98fc", "hash_type": "MD5", "filesize": 38938531, "mtime": "2014-07-22 21:29:43", "url": "/8588/1/Moeller_cp_1973.zip" } ], "eprint_id": 8588, "pos": 1, "placement": 1, "mime_type": "application/x-zip", "format": "application/zip", "format_desc": "TIFF", "language": "en", "security": "internal", "license": "other", 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"http://eprints.org/relation/isIndexCodesVersionOf", "uri": "/id/document/51158" } ] } } ], "eprint_status": "archive", "userid": 87, "dir": "disk0/00/00/85/88", "datestamp": "2014-07-22 21:48:13", "lastmod": "2022-11-09 19:20:13", "status_changed": "2014-07-22 21:48:13", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Moeller-C-P", "name": { "family": "Moeller", "given": "Charles Porter" }, "show_email": "NO" } ] }, "title": "Damping and saturation of a second order electron plasma wave echo", "ispublished": "unpub", "full_text_status": "public", "keywords": "Physics ", "abstract": "A description is given of experimental work on the damping of\r\na second order electron plasma wave echo due to velocity space diffusion\r\nin a low temperature magnetoplasma. Sufficient precision was\r\nobtained to verify the theoretically predicted cubic rather than\r\nquadratic or quartic dependence of the damping on exciter separation.\r\nCompared to the damping predicted for Coulomb collisions in a thermal\r\nplasma in an infinite magnetic field, the magnitude of the damping\r\nwas approximately as predicted, while the velocity dependence of the\r\ndamping was weaker than predicted. The discrepancy is consistent with\r\nthe actual non-Maxwellian electron distribution of the plasma.
\r\n\r\nIn conjunction with the damping work, echo amplitude saturation\r\nwas measured as a function of the velocity of the electrons contributing\r\nto the echo. Good agreement was obtained with the predicted J1\r\nBessel function amplitude dependence, as well as a demonstration that\r\nsaturation did not influence the damping results.
", "date": "1973", "date_type": "degree", "id_number": "CaltechTHESIS:07222014-142622162", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechTHESIS:07222014-142622162", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Tony Diaz", "deposited_by": "Benjamin Perez", "deposited_on": "2014-07-22 21:48:13", "doi": "10.7907/612a-qt04", "divisions": { "items": [ "div_pma" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_defense_date": "1973-01-10", "review_status": "approved", "option_major": { "items": [ "physics" ] }, "copyright_statement": "Author's Rights Authorization: I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted here is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive license to archive and make accessible, under the conditions specified under \"Thesis Availability\" in this submission, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation, or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1973", "author_list": "Moeller, Charles Porter", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/8592", "eprint_id": 8592, "rev_number": 20, "documents": [ { "id": "/id/document/51172", "doc_id": 51172, "rev_number": 2, "files": [ { "id": "/id/file/148168", "fileid": 148168, "datasetid": "document", "objectid": 51172, "filename": "Singh 1971.pdf", "mime_type": "application/pdf", "hash": "721d763ea45a9ac96748a9c82994787b", "hash_type": "MD5", "filesize": 8875983, "mtime": "2014-07-23 16:07:17", "url": "/8592/1/Singh 1971.pdf" } ], "eprint_id": 8592, "pos": 1, "placement": 1, "mime_type": "application/pdf", "format": "application/pdf", "language": "en", "security": "public", "license": "other", "main": "Singh 1971.pdf", 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"/id/document/129266", "doc_id": 129266, "rev_number": 1, "files": [ { "id": "/id/file/374702", "fileid": 374702, "datasetid": "document", "objectid": 129266, "filename": "indexcodes.txt", "mime_type": "text/plain", "hash": "eaa22903110e388930a673e3bf3a1197", "hash_type": "MD5", "filesize": 11625, "mtime": "2021-06-24 03:38:52", "url": "/8592/7/indexcodes.txt" } ], "eprint_id": 8592, "pos": 7, "placement": 7, "mime_type": "text/plain", "format": "other", "format_desc": "Generate index codes conversion from application/pdf to indexcodes", "language": "en", "security": "public", "license": "other", "main": "indexcodes.txt", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/51172" }, { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/51172" }, { "type": "http://eprints.org/relation/isIndexCodesVersionOf", "uri": "/id/document/51172" } ] } } ], "eprint_status": "archive", "userid": 50, "dir": "disk0/00/00/85/92", "datestamp": "2014-07-23 16:28:39", "lastmod": "2022-11-09 19:20:16", "status_changed": "2014-07-23 16:28:39", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Singh-N", "name": { "family": "Singh", "given": "Nagendra" }, "show_email": "NO" } ] }, "title": "Radiation from a short electric dipole antenna in a hot uniaxial plasma", "ispublished": "unpub", "full_text_status": "public", "keywords": "Electrical Engineering", "abstract": "The effects of electron temperature on the radiation fields\r\nand the resistance of a short dipole antenna embedded in a uniaxial\r\nplasma have been studied. It is found that for \u03c9 < \u03c9_p the antenna \r\nexcites two waves, a slow wave and a fast wave. These waves propagate\r\nonly within a cone whose axis is parallel to the biasing magnetostatic\r\nfield B_o and whose semicone angle is slightly less than sin ^(-1) (\u03c9/\u03c9_p).\r\nIn the case of \u03c9 > \u03c9_p the antenna excites two separate modes of \r\nradiation. One of the modes is the electromagnetic mode, while the\r\nother mode is of hot plasma origin. A characteristic interference\r\nstructure is noted in the angular distribution of the field. The far\r\nfields are evaluated by asymptotic methods, while the near fields are\r\ncalculated numerically. The effects of antenna length \u2113, electron\r\nthermal speed, collisional and Landau damping on the near field patterns \r\nhave been studied.
\r\n\r\nThe input and the radiation resistances are calculated and are\r\nshown to remain finite for nonzero electron thermal velocities. The\r\neffect of Landau damping and the antenna length on the input and\r\nradiation resistances has been considered.
\r\n\r\nThe radiation condition for solving Maxwell's equations is\r\ndiscussed and the phase and group velocities for propagation given.\r\nIt is found that for \u03c9 < \u03c9_p in the radial direction (cylindrical coordinates) the power flow is in the opposite direction to that of the phase propagation. For \u03c9 > \u03c9_p the hot plasma mode has similar characteristics.
\r\n\r\n", "date": "1971", "date_type": "degree", "id_number": "CaltechTHESIS:07232014-083706438", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechTHESIS:07232014-083706438", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Tony Diaz", "deposited_on": "2014-07-23 16:28:39", "doi": "10.7907/R9Z4-RG15", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_defense_date": "1970-07-02", "review_status": "approved", "option_major": { "items": [ "eleceng" ] }, "copyright_statement": "Author's Rights Authorization: I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted here is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive license to archive and make accessible, under the conditions specified under \"Thesis Availability\" in this submission, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation, or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1971", "author_list": "Singh, Nagendra", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/8628", "eprint_id": 8628, "rev_number": 17, "documents": [ { "id": "/id/document/51437", "doc_id": 51437, "rev_number": 2, "files": [ { "id": "/id/file/149320", "fileid": 149320, "datasetid": "document", "objectid": 51437, "filename": "Ault_rh_1971.pdf", "mime_type": "application/pdf", "hash": "6927b305a0f4bb001f3d2071b1bccfb6", "hash_type": "MD5", "filesize": 16581597, "mtime": "2014-08-06 16:45:13", "url": "/8628/1/Ault_rh_1971.pdf" } ], "eprint_id": 8628, "pos": 1, "placement": 1, "mime_type": "application/pdf", "format": "application/pdf", "language": "en", "security": "public", "license": "other", "main": "Ault_rh_1971.pdf", 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"http://eprints.org/relation/isIndexCodesVersionOf", "uri": "/id/document/51437" } ] } } ], "eprint_status": "archive", "userid": 104, "dir": "disk0/00/00/86/28", "datestamp": "2014-08-06 16:49:56", "lastmod": "2022-11-07 22:46:50", "status_changed": "2022-11-07 22:46:50", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Ault-Richard-Harold", "name": { "family": "Ault", "given": "Richard Harold" }, "show_email": "NO" } ] }, "title": "Upper Hybrid Resonance Absorption and Scattering from a Plasma Column", "ispublished": "unpub", "full_text_status": "public", "keywords": "Physics, hybrid, absorption, plasma", "abstract": "The electromagnetic scattering and absorption properties of small (kr~1/2) inhomogeneous magnetoplasma columns are calculated via the full set of Maxwell's equations with tensor dielectric constitutive relation. The cold plasma model with collisional damping is used to describe the column. The equations are solved numerically, subject to boundary conditions appropriate to an infinite parallel\r\nstrip line and to an incident plane wave. The results are similar for several density profiles and exhibit semiquantitative agreement with measurements in waveguide. The absorption is spatially limited, especially for small collision frequency, to a narrow hybrid resonant layer and is essentially zero when there is no hybrid layer in the column. The reflection is also enhanced when the hybrid layer is present, but the value of the reflection coefficient is strongly modified by the presence of the glass tube. The nature of the solutions and an extensive discussion of the conditions under which the cold collisional model should yield valid results is presented.
", "date": "1971", "date_type": "degree", "id_number": "CaltechTHESIS:08062014-093858373", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechTHESIS:08062014-093858373", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Tony Diaz", "deposited_by": "Dan Anguka", "deposited_on": "2014-08-06 16:49:56", "doi": "10.7907/RZ3S-9A43", "divisions": { "items": [ "div_pma" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_defense_date": "1971-03-12", "review_status": "approved", "option_major": { "items": [ "physics" ] }, "copyright_statement": "Author's Rights Authorization: I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted here is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive license to archive and make accessible, under the conditions specified under \"Thesis Availability\" in this submission, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation, or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1971", "author_list": "Ault, Richard Harold", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/7139", "eprint_id": 7139, "rev_number": 24, "documents": [ { "id": "/id/document/15062", "doc_id": 15062, "rev_number": 4, "files": [ { "id": "/id/file/98281", "fileid": 98281, "datasetid": "document", "objectid": 15062, "filename": "Fisher_rk_1970.pdf", "mime_type": "application/pdf", "filesize": 11204198, "mtime": "2012-12-26 04:44:20", "url": "/7139/1/Fisher_rk_1970.pdf" } ], "eprint_id": 7139, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "language": "en", "security": "public", "license": "other", "main": "Fisher_rk_1970.pdf", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "final", "relation": { "items": [ { "type": "http://eprints.org/relation/hasVolatileVersion", "uri": "/id/document/28122" }, { "type": "http://eprints.org/relation/haspreviewThumbnailVersion", "uri": "/id/document/28122" }, { "type": "http://eprints.org/relation/hasVersion", "uri": "/id/document/28122" } ] } }, { "id": "/id/document/15063", "doc_id": 15063, "rev_number": 4, "files": [ { "id": "/id/file/207967", "fileid": 207967, "datasetid": "document", "objectid": 15063, "filename": "Fisher_rk_1970.zip", "mime_type": "application/zip", "filesize": 36129693, "mtime": "2016-08-22 21:24:08", "url": "/7139/2/Fisher_rk_1970.zip" } ], "eprint_id": 7139, "pos": 2, "format": "application/zip", "format_desc": "TIF", "language": "en", "security": "internal", "license": "other", "main": "Fisher_rk_1970.zip", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "archival" }, { "id": "/id/document/28122", "doc_id": 28122, "rev_number": 2, "files": [ { "id": "/id/file/98279", "fileid": 98279, "datasetid": "document", "objectid": 28122, "filename": "preview.png", "mime_type": "image/png", "hash": "911055ee8bb72b9083f1d4cf96bf41df", "hash_type": "MD5", "filesize": 30394, "mtime": "2012-12-26 04:44:20", "url": "/7139/3/preview.png" } ], "eprint_id": 7139, "pos": 3, "placement": 3, "mime_type": "image/png", "format": "image/png", "language": "en", "security": "public", "license": "other", "main": "preview.png", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/15062" }, { "type": "http://eprints.org/relation/ispreviewThumbnailVersionOf", "uri": "/id/document/15062" }, { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/15062" } ] } }, { "id": "/id/document/127570", "doc_id": 127570, "rev_number": 1, "files": [ { "id": "/id/file/373006", "fileid": 373006, "datasetid": "document", "objectid": 127570, "filename": "indexcodes.txt", "mime_type": "text/x-c", "hash": "8042e5b8d8bc82cd13af6077a2ccba14", "hash_type": "MD5", "filesize": 18083, "mtime": "2021-06-24 01:52:28", "url": "/7139/4/indexcodes.txt" } ], "eprint_id": 7139, "pos": 4, "placement": 4, "mime_type": "text/x-c", "format": "other", "format_desc": "Generate index codes conversion from application/pdf to indexcodes", "language": "en", "security": "public", "license": "other", "main": "indexcodes.txt", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/15062" }, { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/15062" }, { "type": "http://eprints.org/relation/isIndexCodesVersionOf", "uri": "/id/document/15062" } ] } } ], "eprint_status": "archive", "userid": 50, "dir": "disk0/00/00/71/39", "datestamp": "2012-06-06 22:29:20", "lastmod": "2021-01-16 01:21:31", "status_changed": "2012-06-06 22:29:20", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Fisher-Raymond-Kurt", "name": { "family": "Fisher", "given": "Raymond Kurt" }, "show_email": "NO" } ] }, "title": "Resonance Cones in the Field Pattern of a Short Radio Frequency Probe in a Warm Anisotropic Plasma", "ispublished": "unpub", "full_text_status": "public", "keywords": "Physics; Aeronautics", "abstract": "An experimental investigation of the angular field pattern of a small radio frequency probe in a plasma in a magnetic field is described. The field is observed to become very large along a resonance cone whose axis is parallel to the static magnetic field and whose opening angle is observed to vary with incident probe frequency, electron cyclotron frequency, and electron plasma frequency in agreement with simple cold plasma dielectric theory. The use of the resonance cone angle as a diagnostic tool to measure the plasma density in a plasma in a magnetic field is discussed. It is noted that similar cones might be expected near the ion cyclotron frequency.
\r\n\r\nThe relationship of these cones to the limiting phase- and group-velocity cones which appear in the theory of plane wave propagation is discussed. The necessity for examining the allowed directions of the group velocity rather than the allowed directions of the phase velocity and customary phase velocity plots when determining whether propagation between two remote points in a plasma is possible, is emphasized.
\r\n\r\nThe addition of electron thermal velocities to the theory is examined in the limit of a large static magnetic field. The resonance cone angle is shifted to a slightly smaller angle than that predicted by cold plasma theory, and a fine structure appears inside the cones and is shown to result from an interference between a fast electromagnetic wave and a slow plasma wave. The interference structure is observed experimentally, and measurements of the angular interference spacing are shown to agree with the warm plasma theory.
", "date": "1970", "date_type": "degree", "id_number": "CaltechTHESIS:06062012-143738636", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechTHESIS:06062012-143738636", "related_url": { "items": [ { "description": " Electron Tube and Microwave Laboratory Technical Report", "type": "related", "url": "http://resolver.caltech.edu/CaltechAUTHORS:20190404-163446621" } ] }, "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Office of Naval Research (ONR)", "grant_number": "220(50)" }, { "agency": "United States Atomic Energy Commission" } ] }, "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "local_group": { "items": [ "GALCIT" ] }, "deposited_on": "2012-06-06 22:29:20", "doi": "10.7907/909M-7S46", "divisions": { "items": [ "div_pma" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "email": "rwgould@caltech.edu", "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "email": "rwgould@caltech.edu", "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "member" } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_defense_date": "1970-03-16", "review_status": "approved", "option_major": { "items": [ "physics" ] }, "option_minor": { "items": [ "aeronautics" ] }, "copyright_statement": "Author's Rights Authorization: I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted here is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive license to archive and make accessible, under the conditions specified under \"Thesis Availability\" in this submission, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation, or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1970", "author_list": "Fisher, Raymond Kurt", "advisor_list": "Gould, Roy Walter", "comittee_list": "Gould, Roy Walter" }, { "id": "https://thesis.library.caltech.edu/id/eprint/8594", "eprint_id": 8594, "rev_number": 15, "documents": [ { "id": "/id/document/51186", "doc_id": 51186, "rev_number": 2, "files": [ { "id": "/id/file/148220", "fileid": 148220, "datasetid": "document", "objectid": 51186, "filename": "Stenzel 1970.pdf", "mime_type": "application/pdf", "hash": "ec1e722fb2ca201e23da5f740f5d56f1", "hash_type": "MD5", "filesize": 18419685, "mtime": "2014-07-23 17:27:32", "url": "/8594/1/Stenzel 1970.pdf" } ], "eprint_id": 8594, "pos": 1, "placement": 1, "mime_type": "application/pdf", "format": "application/pdf", "language": "en", "security": "public", "license": "other", "main": "Stenzel 1970.pdf", 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"0", "content": "final" }, { "id": "/id/document/129268", "doc_id": 129268, "rev_number": 1, "files": [ { "id": "/id/file/374704", "fileid": 374704, "datasetid": "document", "objectid": 129268, "filename": "indexcodes.txt", "mime_type": "text/plain", "hash": "e51ba3d5a1ac99b9adb230665048f9f8", "hash_type": "MD5", "filesize": 22178, "mtime": "2021-06-24 03:38:59", "url": "/8594/8/indexcodes.txt" } ], "eprint_id": 8594, "pos": 8, "placement": 8, "mime_type": "text/plain", "format": "other", "format_desc": "Generate index codes conversion from application/pdf to indexcodes", "language": "en", "security": "public", "license": "other", "main": "indexcodes.txt", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/51186" }, { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/51186" }, { "type": "http://eprints.org/relation/isIndexCodesVersionOf", "uri": "/id/document/51186" } ] } } ], "eprint_status": "archive", "userid": 50, "dir": "disk0/00/00/85/94", "datestamp": "2014-07-23 17:59:23", "lastmod": "2022-11-09 19:20:18", "status_changed": "2014-07-23 17:59:23", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Stenzel-R-L", "name": { "family": "Stenzel", "given": "Reiner L." }, "show_email": "NO" } ] }, "title": "Microwave absorption and emission from magnetized afterglow plasmas", "ispublished": "unpub", "full_text_status": "public", "keywords": "Electrical Engineering", "abstract": "The microwave scattering properties of an axially magnetized\r\nafterglow plasma column in an S-band waveguide have been investigated\r\nexperimentally. The column axis is perpendicular to the electric field\r\nand the direction of wave propagation in the H_(10)-mode waveguide.\r\nStrong absorption is found in the range of upper hybrid frequencies, \r\n\u03c9_c \u2264 \u03c9 \u2264 [\u03c9^2_c + \u03c9^2_p(r,t)]^(1/2) where \u03c9_c is the electron cyclotron frequency and \u03c9_p is the locally and temporally varying electron plasma frequency. With the high absorption the noise emission approaches the\r\nblackbody limit. A microwave radiometer has been used to measure the\r\nnoise power and with a comparison and null-technique the electron temperature. As emission and absorption are largely confined to a resonant layer, spatially resolved temperature data are obtained.\r\nTime resolution is obtained by gating the radiometer. The peak\r\nelectron density is derived from the emission or absorption onset at\r\nthe maximum upper hybrid frequency and confirmed by independent measurements. With this diagnostic technique the electron density and temperature decay has been studied under a variety of experimental\r\nconditions. Ambipolar diffusion and collisional cooling essentially\r\naccount for the plasma decay, but impurities and metastable ions\r\nplay an important role. The diagnostic method is successfully applied\r\nin a microwave heating experiment. The existence of absorbing\r\nresonant layers is shown by a peak in the radial temperature profile\r\nwhere the local upper hybrid frequency equals the heating frequency.\r\nThe knowledge of the plasma parameters is important in the study of hot plasma effects. Buchsbaum-Hasegawa modes are investigated in a wide range of magnetic fields (.5 < \u03c9_c/\u03c9 < .985).\r\n", "date": "1970", "date_type": "degree", "id_number": "CaltechTHESIS:07232014-095313314", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechTHESIS:07232014-095313314", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Tony Diaz", "deposited_on": "2014-07-23 17:59:23", "doi": "10.7907/PFRP-ZW64", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_defense_date": "1969-10-15", "review_status": "approved", "option_major": { "items": [ "eleceng" ] }, "copyright_statement": "Author's Rights Authorization: I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted here is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive license to archive and make accessible, under the conditions specified under \"Thesis Availability\" in this submission, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation, or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1970", "author_list": "Stenzel, Reiner L.", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/4672", "eprint_id": 4672, "rev_number": 19, "documents": [ { "id": "/id/document/7538", "doc_id": 7538, "rev_number": 3, "files": [ { "id": "/id/file/46096", "fileid": 46096, "datasetid": "document", "objectid": 7538, "filename": "Blum_fa_1968.pdf", "mime_type": "application/pdf", "filesize": 5142681, "mtime": "2012-12-26 03:10:51", "url": "/4672/1/Blum_fa_1968.pdf" } ], "eprint_id": 4672, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "Scanned, no OCR. 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"media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/97259" }, { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/97259" }, { "type": "http://eprints.org/relation/isIndexCodesVersionOf", "uri": "/id/document/97259" } ] } } ], "eprint_status": "archive", "userid": 2, "dir": "disk0/00/00/46/72", "datestamp": "2008-11-26", "lastmod": "2021-07-22 17:39:45", "status_changed": "2009-09-25 03:23:55", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Blum-Fred-Andrew", "name": { "family": "Blum", "given": "Fred Andrew" }, "show_email": "NO" } ] }, "title": "Echoes and Scattering From Plasma in a Magnetic Field", "ispublished": "unpub", "full_text_status": "public", "keywords": "Physics", "note": "Caltech Nonneutral Plasma Laboratory Technical Report No. 39 (May 1968).\r\n\r\n", "abstract": "A study of the high frequency properties of a low temperature plasma column in a longitudinal magnetic field is described. The experimental observations give a relatively complete picture of the microwave (extraordinary mode) properties of the plasmas studied, encompassing continuous wave scattering and noise emission measurements, as well as the demonstration of the occurrence of related echo processes. Theoretical developments deal largely with a physical model consisting of a one-dimensional slab of cold (zero temperature) plasma which is nonuniform in the steady state and immersed in a uniform magnetic field. Data on the continuous wave reflection and noise emission from some afterglow rare gas discharges are given. The electron temperature in these plasmas is low, approaching room temperature. The reflection and emission are measured as a function of magnetic field in the vicinity of electron cyclotron resonance with electron density as a parameter. The electron densities are such that (\u03c9p/\u03c9) \u2264 1 , where \u03c9p is the electron plasma frequency and \u03c9 is the signal frequency. Both types of experiment show the presence of collective effects which yield a normal mode spectrum strongly dependent on the electron density. A broad peak is observed in the region (\u03c9c/\u03c9) \u2264 1 where \u03c9c is the electron cyclotron frequency. This peak shifts to lower values of (\u03c9c/\u03c9) and broadens as the electron density increases. For all values of electron density, a sharp peak is found very close to (\u03c9c/\u03c9) = 1, the cyclotron resonance condition. The experimental and theoretical results suggest that the phenomena observed involve resonance effects at the upper hybrid frequencies (\u03c9h2 = \u03c9c2 + \u03c9p2) of the plasma. Data are also given on a new two-pulse echo process which occurs in these after-glow plasmas. The results establish the intimate relation between the echoes and the upper hybrid normal modes studied in the CW experiments, demonstrating the dominant role played by collective effects in the formation of this echo. A weakly nonlinear cold plasma theory yields upper hybrid echoes which are strongest in a narrow band of frequencies near the maximum upper hybrid frequency of the nonuniform plasma, in agreement with experiment. Furthermore, large signal computations of the dependence of the echo amplitude on excitation pulse separation and amplitude show a complex behavior in qualitative agreement with experiment. As a supplementary topic, the properties of echoes from a general collection of anharmonic oscillators are discussed. The oscillators in this discussion are a general mathematical analog of the upper hybrid normal modes of a cold nonuniform plasma. Through emphasis of effects due to the finite width of the excitation pulses, the calculations show explicitly the role of the various characteristics of the oscillators in echo processes, further delineating the general features thought requisite of classical multiple-pulse echo systems.\r\n", "date": "1968", "date_type": "degree", "id_number": "CaltechETD:etd-11262008-101013", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-11262008-101013", "related_url": { "items": [ { "description": "Electron Tube and Microwave Laboratory Technical Report 39", "type": "related", "url": "http://resolver.caltech.edu/CaltechAUTHORS:20190404-160452013" } ] }, "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Office of Naval Research (ONR)", "grant_number": "220(50)" }, { "agency": "Hughes Aircraft Company" }, { "agency": "NSF" } ] }, "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "local_group": { "items": [ "Caltech Distinguished Alumni Award" ] }, "deposited_by": "Imported from ETD-db", "deposited_on": "2008-11-26", "doi": "10.7907/ERY7-7A19", "divisions": { "items": [ "div_pma" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "email": "rwgould@caltech.edu", "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "email": "rwgould@caltech.edu", "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "member" } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2008-11-26", "thesis_defense_date": "1968-05-01", "thesis_approved_date": "2008-11-26", "thesis_awards": "Caltech Distinguished Alumni Award, 2019", "review_status": "approved", "option_major": { "items": [ "physics" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1968", "author_list": "Blum, Fred Andrew", "advisor_list": "Gould, Roy Walter", "comittee_list": "Gould, Roy Walter" }, { "id": "https://thesis.library.caltech.edu/id/eprint/8595", "eprint_id": 8595, "rev_number": 28, "documents": [ { "id": "/id/document/51193", "doc_id": 51193, "rev_number": 4, "files": [ { "id": "/id/file/148238", "fileid": 148238, "datasetid": "document", "objectid": 51193, "filename": "Bauer-lo-1968.pdf", "mime_type": "application/pdf", "hash": "1f1fc0eefc4268f39dd4387b1dcca9e3", "hash_type": "MD5", "filesize": 22147918, "mtime": "2014-07-23 18:54:26", "url": "/8595/1/Bauer-lo-1968.pdf" } ], "eprint_id": 8595, "pos": 1, "placement": 1, "mime_type": "application/pdf", "format": "application/pdf", "language": "en", "security": "public", "license": "other", "main": "Bauer-lo-1968.pdf", 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21:27:46", "status_changed": "2014-07-23 19:51:59", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Bauer-Luc-Olivier-Edouard", "name": { "family": "Bauer", "given": "Luc-Olivier Edouard" }, "show_email": "NO" } ] }, "title": "Experimental Study of the Upper Hybrid Echo in Plasmas", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Engineering Science) ; hybrid, echo, plasmas", "abstract": "The two-pulse stimulated radiation of dense (109/cm3 < ne \u2264 1011/cm3) nonuniform neon and argon afterglow plasma columns longitudinally immersed in a magnetic field is studied. The magnetic field is very homogeneous over the plasma volume (\u2206B/B ~ .01%). If the S-band microwave pulses' center frequency is such that they resonantly excite a narrow band of plasma upper hybrid oscillations close to the maximum upper hybrid frequency of the column, strong two pulse echoes are observed. This new echo process is called the upper hybrid echo. The echo spectrum, echo power and echo width were studied as a function of the pulse peak power P, pulse separation \u03c4, relative density (\u03c9po/\u03c9)2, and relative cyclotron frequency (\u03c9c/\u03c9). The complex but systematic variations of the echo properties as a function of the above-mentioned parameters arc found to be in qualitative agreement with those predicted by a theory of Gould and Blum based upon a simple nonuniform unidimensional cold plasma slab model. The possible effects of electron neutral and electron ion collisions not retained in the theoretical model are discussed.
\r\n\r\nThe existence of a new type of cyclotron echo, different from that of Hill and Kaplan and not predicted by the Blum and Gould model is documented. It is believed to be also of a collective effect nature and can probably be described in terms of a theory retaining some hot plasma effects.
\r\n", "date": "1968", "date_type": "degree", "id_number": "CaltechTHESIS:07232014-114203833", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechTHESIS:07232014-114203833", "related_url": { "items": [ { "description": "Article adapted for Appendix A.", "type": "doi", "url": "https://doi.org/10.1103/physrevlett.20.435" }, { "description": "Electron Tube and Microwave Laboratory Technical Report 40", "type": "related", "url": "http://resolver.caltech.edu/CaltechAUTHORS:20190402-164740398" } ] }, "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Council of Scientific Research of Switzerland" }, { "agency": "Office of Naval Research (ONR)", "grant_number": "220(50)" } ] }, "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Dan Anguka", "deposited_on": "2014-07-23 19:51:59", "doi": "10.7907/6GB4-EF52", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "email": "rwgould@caltech.edu", "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_defense_date": "1968-05-16", "review_status": "approved", "option_major": { "items": [ "eng" ] }, "copyright_statement": "Author's Rights Authorization: I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted here is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive license to archive and make accessible, under the conditions specified under \"Thesis Availability\" in this submission, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation, or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1968", "author_list": "Bauer, Luc-Olivier Edouard", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/3883", "eprint_id": 3883, "rev_number": 29, "documents": [ { "id": "/id/document/6523", "doc_id": 6523, "rev_number": 4, "files": [ { "id": "/id/file/39302", "fileid": 39302, "datasetid": "document", "objectid": 6523, "filename": "Poeschel_r_1967.pdf", "mime_type": "application/pdf", "filesize": 6675646, "mtime": "2012-12-26 03:03:40", "url": "/3883/1/Poeschel_r_1967.pdf" } ], "eprint_id": 3883, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "no OCR. 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"http://eprints.org/relation/isVersionOf", "uri": "/id/document/98633" }, { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/98633" }, { "type": "http://eprints.org/relation/isIndexCodesVersionOf", "uri": "/id/document/98633" } ] } } ], "eprint_status": "archive", "userid": 2, "dir": "disk0/00/00/38/83", "datestamp": "2002-10-07", "lastmod": "2024-03-19 22:21:54", "status_changed": "2009-09-25 03:07:20", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Poeschel-Robert-Leslie", "name": { "family": "Poeschel", "given": "Robert Leslie" }, "show_email": "NO" } ] }, "title": "A Nonlinear Study of Beam Plasma Amplification", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Electrical Engineering)", "abstract": "The interaction between an electron beam and the plasma oscillations it excites in traversing a plasma region effectively changes the magnitude and direction of the force between beam electrons. This effect has been studied theoretically and experimentally by computing and observing beam electron velocities and phases for a beam which is initially velocity modulated at frequency \u03c9 and allowed to drift through a plasma filled region of plasma frequency \u03c9p. When \u03c9 > \u03c9p the force between electrons is repulsive and effectively increases in magnitude as \u03c9 approaches \u03c9p. When \u03c9 < \u03c9p, the force between electrons becomes a force of attraction, to within a given inter-electron spacing, and the maximum effect is also at the resonance condition \u03c9 ~ \u03c9p. This property could be used to improve the efficiency of electron bunching in a klystron type amplifier by filling the drift space with a plasma of appropriate density.
\r\n\r\nThe beam behavior is studied theoretically by computing in an exact, nonlinear manner, the trajectories of a disc model electron beam which traverses a linear, dielectric model plasma. The parameters varied are the beam space charge conditions (beam current), the degree of initial velocity modulation, and the ratio of modulation frequency to plasma frequency (\u03c9/\u03c9p) Computations show that it is possible to bunch the beam electrons to within 85% of delta function bunching under some beam and plasma conditions. The electron beam behavior is studied experimentally by observing the beam electron velocity phase distribution with a crossed-field velocity analyzer, and observing the beam current waveform (density-phase distribution) using a wide-band sampling oscilloscope. Experimental results show essentially the same beam behavior as predicted by the computations with some differences which are attributed to variation in the plasma density along the beam path.
\r\n", "date": "1967", "date_type": "degree", "id_number": "CaltechETD:etd-10032002-160203", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-10032002-160203", "related_url": { "items": [ { "description": "Electron Tube and Microwave Laboratory Technical Report 33", "type": "related", "url": "http://resolver.caltech.edu/CaltechAUTHORS:20190329-142611914" } ] }, "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Office of Naval Research (ONR)", "grant_number": "220(50)" }, { "agency": "RCA" }, { "agency": "Hughes Aircraft Company" } ] }, "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Imported from ETD-db", "deposited_on": "2002-10-07", "doi": "10.7907/2Z3J-2V17", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2002-10-03", "thesis_defense_date": "1966-11-08", "thesis_approved_date": "2002-10-07", "review_status": "approved", "option_major": { "items": [ "eleceng" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1967", "author_list": "Poeschel, Robert Leslie", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/3613", "eprint_id": 3613, "rev_number": 8, "documents": [ { "id": "/id/document/6185", "doc_id": 6185, "rev_number": 2, "files": [ { "id": "/id/file/37022", "fileid": 37022, "datasetid": "document", "objectid": 6185, "filename": "Hinton_fl_1967.pdf", "mime_type": "application/pdf", "filesize": 4106482, "mtime": "2012-12-26 03:01:21", "url": "/3613/1/Hinton_fl_1967.pdf" } ], "eprint_id": 3613, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "Hinton_fl_1967.pdf", "language": "en", "security": "public", "license": "other", "main": "Hinton_fl_1967.pdf", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "final", "relation": { "items": [ { "type": "http://eprints.org/relation/hasVolatileVersion", "uri": "/id/document/22723" }, { "type": "http://eprints.org/relation/haspreviewThumbnailVersion", "uri": "/id/document/22723" }, { "type": "http://eprints.org/relation/hasVersion", "uri": "/id/document/22723" } ] } }, { "id": "/id/document/22723", "doc_id": 22723, "rev_number": 2, "files": [ { "id": "/id/file/37020", "fileid": 37020, "datasetid": "document", "objectid": 22723, "filename": "preview.png", "mime_type": "image/png", "hash": "38fe1d3296faca126d59d178c827ef2c", "hash_type": "MD5", "filesize": 9195, "mtime": "2012-12-26 03:01:21", "url": "/3613/2/preview.png" } ], "eprint_id": 3613, "pos": 2, "placement": 2, "mime_type": "image/png", "format": "image/png", "language": "en", "security": "public", "license": "other", "main": "preview.png", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/6185" }, { "type": "http://eprints.org/relation/ispreviewThumbnailVersionOf", "uri": "/id/document/6185" }, { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/6185" } ] } } ], "eprint_status": "archive", "userid": 2, "dir": "disk0/00/00/36/13", "datestamp": "2002-09-19", "lastmod": "2024-03-18 22:54:47", "status_changed": "2009-09-25 03:01:39", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Hinton-Frederick-Lee", "name": { "family": "Hinton", "given": "Frederick Lee" }, "show_email": "NO" } ] }, "title": "Collisionless Absorption and Emission of Electromagnetic Waves by a Bounded Plasma", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Physics)", "abstract": "The absorption and emission of electromagnetic waves by a hot bounded plasma can be greatly influenced by the collective behavior of the plasma. A homogeneous slab model of a hot plasma is used in a theoretical study of these collective effects. A boundary-value problem is solved to find the fields in the plasma when a plane wave is incident on the plasma boundary. Power is found to be absorbed from the incident wave because of the Landau damping of longitudinal plasma waves excited in the plasma. If the incident wave frequency is close to one of the plasma wave resonance frequencies, the absorption may be substantial, but only if the Landau damping rate is approximately equal to the radiation damping rate, i.e. if the plasma is \"matched\" to the radiation field. The width of an absorption line is the sum of the Landau damping and radiation damping widths. Electromagnetic noise radiation is emitted from a collisionless plasma because of the coupling of the field fluctuations in the plasma to the external radiation field at the plasma boundary. Plasma wave fluctuations are excited by fast electrons in the plasma and are reinforced by the collective response of the plasma at the resonance frequencies. Emission and absorption are related by Kirchhoff's law for a thermal plasma. For a nonthermal plasma the emission may be enhanced if there are many electrons in a high-energy tail of the distribution function", "date": "1967", "date_type": "degree", "id_number": "CaltechETD:etd-09182002-132502", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-09182002-132502", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Imported from ETD-db", "deposited_on": "2002-09-19", "doi": "10.7907/SP8Y-BR19", "divisions": { "items": [ "div_pma" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2002-09-18", "thesis_defense_date": "1967-05-15", "thesis_approved_date": "2002-09-19", "review_status": "approved", "option_major": { "items": [ "physics" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1967", "author_list": "Hinton, Frederick Lee", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/1338", "eprint_id": 1338, "rev_number": 7, "documents": [ { "id": "/id/document/2050", "doc_id": 2050, "rev_number": 2, "files": [ { "id": "/id/file/12775", "fileid": 12775, "datasetid": "document", "objectid": 2050, "filename": "Hertel_rh_1965.pdf", "mime_type": "application/pdf", "filesize": 6361745, "mtime": "2012-12-26 02:37:24", "url": "/1338/1/Hertel_rh_1965.pdf" } ], "eprint_id": 1338, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "Hertel_rh_1965.pdf", "language": "en", "security": "public", "license": "other", "main": "Hertel_rh_1965.pdf", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "final", "relation": { "items": [ { "type": "http://eprints.org/relation/hasVolatileVersion", "uri": "/id/document/18815" }, { "type": "http://eprints.org/relation/haspreviewThumbnailVersion", "uri": "/id/document/18815" }, { "type": "http://eprints.org/relation/hasVersion", "uri": "/id/document/18815" } ] } }, { "id": "/id/document/18815", "doc_id": 18815, "rev_number": 2, "files": [ { "id": "/id/file/12773", "fileid": 12773, "datasetid": "document", "objectid": 18815, "filename": "preview.png", "mime_type": "image/png", "hash": "e3da2c12a05d2722eee42a528f3ec07e", "hash_type": "MD5", "filesize": 8540, "mtime": "2012-12-26 02:37:24", "url": "/1338/2/preview.png" } ], "eprint_id": 1338, "pos": 2, "placement": 2, "mime_type": "image/png", "format": "image/png", "language": "en", "security": "public", "license": "other", "main": "preview.png", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/2050" }, { "type": "http://eprints.org/relation/ispreviewThumbnailVersionOf", "uri": "/id/document/2050" }, { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/2050" } ] } } ], "eprint_status": "archive", "userid": 2, "dir": "disk0/00/00/13/38", "datestamp": "2003-04-11", "lastmod": "2019-12-21 02:33:19", "status_changed": "2009-09-25 02:01:52", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Hertel-R-H", "name": { "family": "Hertel", "given": "Robert Henry" }, "show_email": "NO" } ] }, "title": "An experimental study of the hydromagnetic waveguide", "ispublished": "unpub", "full_text_status": "public", "abstract": "The hydromagnetic waveguide consists of a cylindrical metal tube filled with a longitudinally magnetized plasma. Among the classes of waves which propagate in this system are the compressional hydromagnetic modes, characterized by a waveguide cutoff at low frequencies and by a resonance at the electron cyclotron frequency. This paper presents the results of observations of the propagation of such waves in a decaying hydrogen plasma at frequencies from 0.8 to 3.4 times the ion cyclotron frequency. The phase shift and attenuation of the waves are interpreted in terms of the ion density and the temperature by applying a theory based on a three-fluid description of the plasma. Spectroscopic measurements of the H[subscript beta] line profile and absolute intensity are used to check the density and temperature inferred from the wave measurements.\n\nThe results of this study indicate that a simple approximate relationship between the phase factor and density obtained by neglecting dissipation gives densities which agree well with the spectroscopic measurements. As a diagnostic tool this method may yield densities to within ? 25%, over a range of two decades. In the case of amplitude measurements only semiquantitative agreement between the wave and spectroscopic measurements is found, but the amplitude curves do show evidence of interferences between modes and a sharp cutoff at a critical density, both effects predicted by the theory.", "date": "1965", "date_type": "degree", "id_number": "CaltechETD:etd-04112003-095820", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-04112003-095820", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "deposited_by": "Imported from ETD-db", "deposited_on": "2003-04-11", "doi": "10.7907/6RG2-ND30", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2003-04-11", "thesis_defense_date": "1965-01-21", "thesis_approved_date": "2003-04-11", "review_status": "approved", "option_major": { "items": [ "engappsci" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1965", "author_list": "Hertel, Robert Henry", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/3775", "eprint_id": 3775, "rev_number": 26, "documents": [ { "id": "/id/document/6413", "doc_id": 6413, "rev_number": 4, "files": [ { "id": "/id/file/38474", "fileid": 38474, "datasetid": "document", "objectid": 6413, "filename": "Bond_r_1965.pdf", "mime_type": "application/pdf", "filesize": 4458833, "mtime": "2012-12-26 03:02:54", "url": "/3775/1/Bond_r_1965.pdf" } ], "eprint_id": 3775, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "no OCR. 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For a planar Langmuir probe it is shown that g(vz) = - [(m\u2202Jp)/(e2\u2202Vp)] where vz = \u221a[2(e/m)Vp] and g(vz) gives the density of electrons with velocities normal to the probe in the range vz to vz + dvz. This expression is valid for any distribution function making it possible to study anisotropies merely by changing the orientation of the probe. If the distribution function is isotropic the above expres- sion is valid for cylindrical and small spherical probes as well.
\r\n\r\nThis technique is applied to the measurement of the directional properties of electron velocity distributions in the positive column of neon and helium hot cathode discharges. The necessary planar probe consists of a 0.01 inch diameter circular probe surrounded by a 0.090 inch square guard-ring. The measured distributions were Druyvesteyn in form except that all electrons were shifted in energy (in the direction of the external field) by an amount proportional to E\u03bb(vz). Here E is the magnitude of the external electric field and \u03bb(vz) the electron mean free path as a function of vz. The experimental conditions are shown to be identical with those necessary in the derivation of the Druyvesteyn distribution.
", "date": "1965", "date_type": "degree", "id_number": "CaltechETD:etd-09262002-144942", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-09262002-144942", "related_url": { "items": [ { "description": "Electron Tube and Microwave Laboratory Technical Report 25", "type": "related", "url": "http://resolver.caltech.edu/CaltechAUTHORS:20190322-170124673" } ] }, "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Office of Naval Research (ONR)", "grant_number": "220(50)" }, { "agency": "IBM" }, { "agency": "Hughes Aircraft Company" } ] }, "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Imported from ETD-db", "deposited_on": "2002-09-27", "doi": "10.7907/VZM2-A856", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Langmuir-R-V", "name": { "family": "Langmuir", "given": "Robert V." }, "role": "advisor" }, { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2002-09-26", "thesis_defense_date": "1965-05-14", "thesis_approved_date": "2002-09-27", "review_status": "approved", "option_major": { "items": [ "eleceng" ] }, "option_minor": { "items": [ "physics" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1965", "author_list": "Bond, Robert Harold", "advisor_list": "Langmuir, Robert V. and Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/4241", "eprint_id": 4241, "rev_number": 24, "documents": [ { "id": "/id/document/6975", "doc_id": 6975, "rev_number": 4, "files": [ { "id": "/id/file/42377", "fileid": 42377, "datasetid": "document", "objectid": 6975, "filename": "Parker_jv_1964.pdf", "mime_type": "application/pdf", "filesize": 6402973, "mtime": "2012-12-26 03:06:49", "url": "/4241/1/Parker_jv_1964.pdf" } ], "eprint_id": 4241, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "No OCR. 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A theory is considered which includes the effects of electron temperature and of nonuniformities in the plasma electron density. In order to have a quantitative theory, the nonuniform electron densities used are calculated numerically using a theory due to Tonks and Langmuir.
\r\n\r\nThe theory yields a fourth order differential equation which is integrated numerically to find the predicted resonant frequencies. The predictions are compared with experiment and show excellent agreement. It is concluded that the nonuniform electron density plays a crucial role in determining the resonant frequencies.
\r\n\r\nThe effect of an axial magnetic field upon the resonances has been investigated. It is shown that the field causes each resonance to split into a right and left circularly polarized resonance whose frequencies depend on the field strength. These preliminary calculations have been checked with experiment and they give good qualitative agreement.
\r\n\r\nPossible diagnostic uses of these results are considered.
", "date": "1964", "date_type": "degree", "id_number": "CaltechETD:etd-10252002-112648", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-10252002-112648", "related_url": { "items": [ { "description": "Electron Tube and Microwave Laboratory Technical Report 23", "type": "related", "url": "http://resolver.caltech.edu/CaltechAUTHORS:20190322-085552944" } ] }, "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Office of Naval Research (ONR)", "grant_number": "220(50)" }, { "agency": "NSF" } ] }, "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Imported from ETD-db", "deposited_on": "2002-11-11", "doi": "10.7907/BM8B-PN62", "divisions": { "items": [ "div_pma" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2002-10-25", "thesis_defense_date": "1964-05-26", "thesis_approved_date": "2002-11-11", "review_status": "approved", "option_major": { "items": [ "physics" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1964", "author_list": "Parker, Jerald Vawer", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/3828", "eprint_id": 3828, "rev_number": 12, "documents": [ { "id": "/id/document/6466", "doc_id": 6466, "rev_number": 2, "files": [ { "id": "/id/file/38885", "fileid": 38885, "datasetid": "document", "objectid": 6466, "filename": "Lieberman_a_1964.pdf", "mime_type": "application/pdf", "filesize": 6969476, "mtime": "2012-12-26 03:03:17", "url": "/3828/1/Lieberman_a_1964.pdf" } ], "eprint_id": 3828, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "Lieberman_a_1964.pdf", "language": "en", "security": "public", "license": "other", "main": "Lieberman_a_1964.pdf", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "final", "relation": { "items": [ { "type": "http://eprints.org/relation/hasVolatileVersion", "uri": "/id/document/22998" }, { "type": "http://eprints.org/relation/haspreviewThumbnailVersion", "uri": "/id/document/22998" }, { "type": "http://eprints.org/relation/hasVersion", "uri": "/id/document/22998" } ] } }, { "id": "/id/document/22998", "doc_id": 22998, "rev_number": 2, "files": [ { "id": "/id/file/38883", "fileid": 38883, "datasetid": "document", "objectid": 22998, "filename": "preview.png", "mime_type": "image/png", "hash": "2129490c858558a6fc5aac982e3b888e", "hash_type": "MD5", "filesize": 8017, "mtime": "2012-12-26 03:03:17", "url": "/3828/2/preview.png" } ], "eprint_id": 3828, "pos": 2, "placement": 2, "mime_type": "image/png", "format": "image/png", "language": "en", "security": "public", "license": "other", "main": "preview.png", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/6466" }, { "type": "http://eprints.org/relation/ispreviewThumbnailVersionOf", "uri": "/id/document/6466" }, { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/6466" } ] } } ], "eprint_status": "archive", "userid": 2, "dir": "disk0/00/00/38/28", "datestamp": "2002-09-30", "lastmod": "2024-01-19 22:46:37", "status_changed": "2009-09-25 03:06:35", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Lieberman-Alfred-George", "name": { "family": "Lieberman", "given": "Alfred George" }, "show_email": "NO" } ] }, "title": "Mode Excitation and Propagation in Waveguides Containing Anistropic Plasmas", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Electrical Engineering and Physics)", "abstract": "An analysis is presented of perfectly-conducting cylindrical structures completely filled with cold, anisotropic plasmas. Major, but not exclusive, consideration is directed to the circular waveguide containing a lossless, longitudinally magnetized plasma. The modes are generally a mixture of TE and TM fields with the result that the conventional orthogonality relations must be replaced by appropriate generalizations. The orthogonality relations are used to determine the fields excited in a longitudinally magnetized plasmaguide*by a coaxial current loop. At cut-off, resonance, and at limiting values of the system's parameters, the modes reduce to simple TE or TM waves. The field configuration and dispersion are examined at these limiting conditions as well as at intermediate values of the parameters. Numerical results are provided for the cut-off frequencies and dispersion relation.\r\n\r\n*Plasmaguide is the generic name given to any metallic waveguide containing an anisotropic plasma. In this manuscript it will refer to the longitudinally-magnetized, plasma-filled waveguide.", "date": "1964", "date_type": "degree", "id_number": "CaltechETD:etd-09302002-120628", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-09302002-120628", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Imported from ETD-db", "deposited_on": "2002-09-30", "doi": "10.7907/DCTN-2N35", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2002-09-30", "thesis_defense_date": "1964-01-01", "thesis_approved_date": "2002-09-30", "review_status": "approved", "option_major": { "items": [ "eleceng" ] }, "option_minor": { "items": [ "physics" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1964", "author_list": "Lieberman, Alfred George", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/4153", "eprint_id": 4153, "rev_number": 23, "documents": [ { "id": "/id/document/6853", "doc_id": 6853, "rev_number": 4, "files": [ { "id": "/id/file/41579", "fileid": 41579, "datasetid": "document", "objectid": 6853, "filename": "Nickel_jc_1964.pdf", "mime_type": "application/pdf", "filesize": 5724370, "mtime": "2012-12-26 03:05:55", "url": "/4153/1/Nickel_jc_1964.pdf" } ], "eprint_id": 4153, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "No OCR. 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"http://eprints.org/relation/isVersionOf", "uri": "/id/document/98621" }, { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/98621" }, { "type": "http://eprints.org/relation/isIndexCodesVersionOf", "uri": "/id/document/98621" } ] } } ], "eprint_status": "archive", "userid": 2, "dir": "disk0/00/00/41/53", "datestamp": "2002-10-21", "lastmod": "2024-01-19 23:38:53", "status_changed": "2009-09-25 03:12:33", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Nickel-John-Carl", "name": { "family": "Nickel", "given": "John Carl" }, "show_email": "NO" } ] }, "title": "Experimental Study of Plasma Wave Resonances in a Hot Nonuniform Plasma Column", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Physics)", "abstract": "The relative frequency spectrum \u03c92/\u03c92̅p of plasma wave resonances in the positive column of a low pressure mercury discharge tube has been shown to depend upon the parameter r2w/\u03bb2̅D where rw is the radius of the column, \u03bb2̅D is the Debye length defined in terms of the average electron density, and \u03c92̅p is the square of the average plasma frequency. This paper presents observations of both dipole and quadrupole resonance spectra made on several discharge tubes with rw ranging from 0.30 to 0.87 cm. For these measurements r2w/\u03bb2̅D varies from about 102 to 105, and the best fit electron temperatures are found to be of the order of 3 ev. The average electron densities are directly measured using a cavity perturbation technique.
\r\n\r\nThe results of these observations are found to be in good agreement with the theory based upon the first two moments of the correlationless Boltzmann equation in conjunction with Parker's electron density profile for a low density positive column. The results of a preliminary investigation of the effects of an axial, static magnetic field on the dipole resonance spectrum are also presented. These results indicate that in the presence of an axial magnetic field not only does the lowest resonance (approximately predicted by the cold plasma theory) split, but the next higher order resonance also splits. For the lowest resonance, it is found that \u0394\u03c9/\u03c9g \u2248 .8 \u00b1 .1, while for the next higher order resonance \u0394\u03c9/\u03c9g \u2248 .5 \u00b1 .2, where \u03c9g is the cyclotron frequency. These preliminary results are in good accord with calculations made by Parker, again using the moment equation approach.
", "date": "1964", "date_type": "degree", "id_number": "CaltechETD:etd-10182002-102050", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-10182002-102050", "related_url": { "items": [ { "description": "Electron Tube and Microwave Laboratory Technical Report 22", "type": "related", "url": "http://resolver.caltech.edu/CaltechAUTHORS:20190320-113519678" } ] }, "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Office of Naval Research (ONR)", "grant_number": "220(50)" } ] }, "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Imported from ETD-db", "deposited_on": "2002-10-21", "doi": "10.7907/4TNV-Z616", "divisions": { "items": [ "div_pma" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2002-10-18", "thesis_defense_date": "1964-05-27", "thesis_approved_date": "2002-10-21", "review_status": "approved", "option_major": { "items": [ "physics" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1964", "author_list": "Nickel, John Carl", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/7041", "eprint_id": 7041, "rev_number": 14, "documents": [ { "id": "/id/document/14792", "doc_id": 14792, "rev_number": 4, "files": [ { "id": "/id/file/96037", "fileid": 96037, "datasetid": "document", "objectid": 14792, "filename": "Swanson_dg_1963.pdf", "mime_type": "application/pdf", "filesize": 3379409, "mtime": "2012-12-26 04:43:07", "url": "/7041/1/Swanson_dg_1963.pdf" } ], "eprint_id": 7041, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "language": "en", "security": "public", "license": "other", "main": "Swanson_dg_1963.pdf", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "final", "relation": { "items": [ { "type": "http://eprints.org/relation/hasVolatileVersion", "uri": "/id/document/28033" }, { "type": "http://eprints.org/relation/haspreviewThumbnailVersion", "uri": "/id/document/28033" }, { "type": "http://eprints.org/relation/hasVersion", "uri": "/id/document/28033" } ] } }, { "id": "/id/document/14793", "doc_id": 14793, "rev_number": 3, "files": [ { "id": "/id/file/207925", "fileid": 207925, "datasetid": "document", "objectid": 14793, "filename": "Swanson_dg_1963.zip", "mime_type": "application/zip", "filesize": 11093166, "mtime": "2016-08-22 21:23:57", "url": "/7041/2/Swanson_dg_1963.zip" } ], "eprint_id": 7041, "pos": 2, "format": "application/zip", "format_desc": "TIFF", "language": "en", "security": "internal", "license": "other", "main": "Swanson_dg_1963.zip", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "final" }, { "id": "/id/document/28033", "doc_id": 28033, "rev_number": 2, "files": [ { "id": "/id/file/96035", "fileid": 96035, "datasetid": "document", "objectid": 28033, "filename": "preview.png", "mime_type": "image/png", "hash": "2b0611aa76e08b3505deee85c973831d", "hash_type": "MD5", "filesize": 15248, "mtime": "2012-12-26 04:43:07", "url": "/7041/3/preview.png" } ], "eprint_id": 7041, "pos": 3, "placement": 3, "mime_type": "image/png", "format": "image/png", "language": "en", "security": "public", "license": "other", "main": "preview.png", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/14792" }, { "type": "http://eprints.org/relation/ispreviewThumbnailVersionOf", "uri": "/id/document/14792" }, { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/14792" } ] } }, { "id": "/id/document/127431", "doc_id": 127431, "rev_number": 1, "files": [ { "id": "/id/file/372867", "fileid": 372867, "datasetid": "document", "objectid": 127431, "filename": "indexcodes.txt", "mime_type": "text/plain", "hash": "c4a0a72250db46251de0fcedb6a90369", "hash_type": "MD5", "filesize": 17403, "mtime": "2021-06-24 01:45:37", "url": "/7041/4/indexcodes.txt" } ], "eprint_id": 7041, "pos": 4, "placement": 4, "mime_type": "text/plain", "format": "other", "format_desc": "Generate index codes conversion from application/pdf to indexcodes", "language": "en", "security": "public", "license": "other", "main": "indexcodes.txt", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/14792" }, { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/14792" }, { "type": "http://eprints.org/relation/isIndexCodesVersionOf", "uri": "/id/document/14792" } ] } } ], "eprint_status": "archive", "userid": 51, "dir": "disk0/00/00/70/41", "datestamp": "2012-05-18 18:04:40", "lastmod": "2024-01-09 00:52:30", "status_changed": "2012-05-18 18:04:40", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Swanson-Donald-Gary", "name": { "family": "Swanson", "given": "Donald Gary" }, "show_email": "NO" } ] }, "title": "An Experimental Study of Compressional Hydromagnetic Waves", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Physics)", "abstract": "An experiment is described in which a compressional hydromagnetic wave is observed in a hydrogen plasma-filled waveguide. The theory of a cool, partially ionized, resistive plasma in a magnetic field is described briefly and expressions are derived for the dispersion relation and transfer function which include both the propagation and attenuation constants as a function of frequency. Measurements of the cutoff frequency are presented which verify its linear dependence on the magnetic field, and they show good agreement with theory on the variation with the ion mass density. The impulse response of the plasma is studied, transformed into the frequency domain, and quantitative comparisons are made with the theoretical transfer function to determine the degree of ionization, the resistivity, and the ion-neutral collision frequency.
\r\n\r\nResults indicate that the degree of ionization varies over a range from 75% to 45% when the initial density changes from 1.3 \u2022 10^(21) to 1.4 \u2022 10^(22) atoms/m^3. The measured resistivity appears to increase with the magnetic field, with the mean value corresponding to a temperature of the order of 5 \u2022 10^3 \u00b0K. The average value of the product of the charge exchange cross section and the neutral thermal speed is found to be approximately (5.5 \u00b1 1.3) \u2022 10^(-15) m^3/sec.
\r\n", "date": "1963", "date_type": "degree", "id_number": "CaltechTHESIS:05172012-132525991", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechTHESIS:05172012-132525991", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Tony Diaz", "deposited_on": "2012-05-18 18:04:40", "doi": "10.7907/XBT0-FD96", "divisions": { "items": [ "div_pma" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_defense_date": "1963-01-01", "review_status": "approved", "option_major": { "items": [ "physics" ] }, "copyright_statement": "Author's Rights Authorization: I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted here is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive license to archive and make accessible, under the conditions specified under \"Thesis Availability\" in this submission, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation, or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1963", "author_list": "Swanson, Donald Gary", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/6588", "eprint_id": 6588, "rev_number": 17, "documents": [ { "id": "/id/document/13415", "doc_id": 13415, "rev_number": 4, "files": [ { "id": "/id/file/86957", "fileid": 86957, "datasetid": "document", "objectid": 13415, "filename": "Shimabukuro_fi_1962.pdf", "mime_type": "application/pdf", "filesize": 19176144, "mtime": "2012-12-26 04:38:13", "url": "/6588/1/Shimabukuro_fi_1962.pdf" } ], "eprint_id": 6588, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "language": "en", "security": "public", "license": "other", "main": "Shimabukuro_fi_1962.pdf", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "final", "relation": { "items": [ { "type": "http://eprints.org/relation/hasVolatileVersion", "uri": "/id/document/27682" }, { "type": "http://eprints.org/relation/haspreviewThumbnailVersion", "uri": "/id/document/27682" }, { "type": "http://eprints.org/relation/hasVersion", "uri": "/id/document/27682" } ] } }, { "id": "/id/document/13416", "doc_id": 13416, "rev_number": 3, "files": [ { "id": "/id/file/207415", "fileid": 207415, "datasetid": "document", "objectid": 13416, "filename": "Shimabukuro_fi_1962.zip", "mime_type": "application/zip", "filesize": 62042773, "mtime": "2016-08-22 21:23:06", "url": "/6588/2/Shimabukuro_fi_1962.zip" } ], "eprint_id": 6588, "pos": 2, "format": "application/zip", "format_desc": "TIFF", "language": "en", "security": "internal", "license": "other", "main": "Shimabukuro_fi_1962.zip", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "final" }, { "id": "/id/document/27682", "doc_id": 27682, "rev_number": 2, "files": [ { "id": "/id/file/86955", "fileid": 86955, "datasetid": "document", "objectid": 27682, "filename": "preview.png", "mime_type": "image/png", "hash": "69c4a575185928b3e4a8b15884fa7952", "hash_type": "MD5", "filesize": 8209, "mtime": "2012-12-26 04:38:13", "url": "/6588/3/preview.png" } ], "eprint_id": 6588, "pos": 3, "placement": 3, "mime_type": "image/png", "format": "image/png", "language": "en", "security": "public", "license": "other", "main": "preview.png", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/13415" }, { "type": "http://eprints.org/relation/ispreviewThumbnailVersionOf", "uri": "/id/document/13415" }, { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/13415" } ] } }, { "id": "/id/document/126951", "doc_id": 126951, "rev_number": 1, "files": [ { "id": "/id/file/372385", "fileid": 372385, "datasetid": "document", "objectid": 126951, "filename": "indexcodes.txt", "mime_type": "text/plain", "hash": "0e2ad4c53da3a4e2a05432f6ace31cba", "hash_type": "MD5", "filesize": 12945, "mtime": "2021-06-24 01:14:45", "url": "/6588/4/indexcodes.txt" } ], "eprint_id": 6588, "pos": 4, "placement": 4, "mime_type": "text/plain", "format": "other", "format_desc": "Generate index codes conversion from application/pdf to indexcodes", "language": "en", "security": "public", "license": "other", "main": "indexcodes.txt", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/13415" }, { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/13415" }, { "type": "http://eprints.org/relation/isIndexCodesVersionOf", "uri": "/id/document/13415" } ] } } ], "eprint_status": "archive", "userid": 51, "dir": "disk0/00/00/65/88", "datestamp": "2011-08-23 18:18:56", "lastmod": "2023-12-21 21:38:54", "status_changed": "2011-08-23 18:18:56", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Shimabukuro-Fred-Ichiro", "name": { "family": "Shimabukuro", "given": "Fred Ichiro" }, "show_email": "NO" } ] }, "title": "A Study of Dispersion in Plasmas", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Electrical Engineering and Physics)", "abstract": "The wave propagation characteristics in a stationary unbounded plasma in a static arbitrary magnetic field are reviewed. If the plasma is drifting, a Lorentz transformation can be made to obtain the \u03c9-k relations in the reference frame where the plasma is moving. The transformation is a simple one for the slow waves with non-relativistic drift velocities. The modified waves for the drifting plasma have an important bearing on the instability of the transverse modes in a system of a drifting plasma in a plasma.\r\n\r\nThe dispersion for bounded (cylindrical geometry) plasmas is\r\nstudied, where the propagation vector is along the z-axis. The salient features of these waves are obtained by studying the circularly symmetric mode. The general features predicted by the quasi-static approximation are verified and the exact and quasi-static solutions are compared. The range of validity of the quasi-static\r\napproximation is determined and the h-values are plotted. As the radius becomes larger these modes evolve into the plane wave cases of the unbounded plasma.\r\n\r\nWhen a fast beam of charged particles, electrons, ions or a plasma, traverses a stationary plasma in a magnetic field, there is a possibility of unstable transverse modes of propagation. If the drifting particles are either electrons or ions, the circularly polarized waves exhibit an instability over a very narrow frequency range near the ion and electron cyclotron frequencies respectively. When a plasma drifts through a plasma, in addition to the instabilities noted above, there can be an instability near zero frequency, and the growth condition is determined. For typical parameter values these transverse modes have greater growth constants than the longitudinal mode. These unstable transverse modes have possible applications in the generation of high frequencies, and are possible explanations for various instabilities in the ionosphere.\r\n", "date": "1962", "date_type": "degree", "id_number": "CaltechTHESIS:08172011-135421197", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechTHESIS:08172011-135421197", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Tony Diaz", "deposited_on": "2011-08-23 18:18:56", "doi": "10.7907/W2HJ-XE62", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Dow-D-G", "name": { "family": "Dow", "given": "Daniel G." }, "role": "advisor" }, { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_defense_date": "1962-01-01", "review_status": "approved", "option_major": { "items": [ "eleceng" ] }, "option_minor": { "items": [ "physics" ] }, "copyright_statement": "Author's Rights Authorization: I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted here is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive license to archive and make accessible, under the conditions specified under \"Thesis Availability\" in this submission, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation, or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1962", "author_list": "Shimabukuro, Fred Ichiro", "advisor_list": "Dow, Daniel G. and Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/6569", "eprint_id": 6569, "rev_number": 26, "documents": [ { "id": "/id/document/13363", "doc_id": 13363, "rev_number": 4, "files": [ { "id": "/id/file/86658", "fileid": 86658, "datasetid": "document", "objectid": 13363, "filename": "Mason_pv_1962.pdf", "mime_type": "application/pdf", "filesize": 24902546, "mtime": "2012-12-26 04:38:02", "url": "/6569/1/Mason_pv_1962.pdf" } ], "eprint_id": 6569, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "language": "en", "security": "public", "license": "other", "main": "Mason_pv_1962.pdf", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "final", "relation": { "items": [ { "type": "http://eprints.org/relation/hasVolatileVersion", "uri": "/id/document/27665" }, { "type": "http://eprints.org/relation/haspreviewThumbnailVersion", "uri": "/id/document/27665" }, { "type": "http://eprints.org/relation/hasVersion", "uri": "/id/document/27665" } ] } }, { "id": "/id/document/27665", "doc_id": 27665, "rev_number": 2, "files": [ { "id": "/id/file/86656", "fileid": 86656, "datasetid": "document", "objectid": 27665, "filename": "preview.png", "mime_type": "image/png", "hash": "17367cd21a2f9a2531ec84158bea8f8e", "hash_type": "MD5", "filesize": 10990, "mtime": "2012-12-26 04:38:01", "url": "/6569/3/preview.png" } ], "eprint_id": 6569, "pos": 3, "placement": 3, "mime_type": "image/png", "format": "image/png", "language": "en", "security": "public", "license": "other", "main": "preview.png", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/13363" }, { "type": "http://eprints.org/relation/ispreviewThumbnailVersionOf", "uri": "/id/document/13363" }, { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/13363" } ] } }, { "id": "/id/document/103221", "doc_id": 103221, "rev_number": 3, "files": [ { "id": "/id/file/297442", "fileid": 297442, "datasetid": "document", "objectid": 103221, "filename": "Mason_pv_1962.zip", "mime_type": "application/x-zip", "hash": "96f8fadc0a79212ad2dabbdcccd4121a", "hash_type": "MD5", "filesize": 94210590, "mtime": "2019-09-24 22:43:34", "url": "/6569/5/Mason_pv_1962.zip" } ], "eprint_id": 6569, "pos": 5, "placement": 5, "mime_type": "application/x-zip", "format": "application/zip", "format_desc": "TIFFs", "language": "en", "security": "internal", "license": "other", "main": "Mason_pv_1962.zip", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "archival" }, { "id": "/id/document/126933", "doc_id": 126933, "rev_number": 1, "files": [ { "id": "/id/file/372367", "fileid": 372367, "datasetid": "document", "objectid": 126933, "filename": "indexcodes.txt", "mime_type": "text/plain", "hash": "52ac5c374a0268efcd5ddde75c848468", "hash_type": "MD5", "filesize": 22705, "mtime": "2021-06-24 01:13:37", "url": "/6569/6/indexcodes.txt" } ], "eprint_id": 6569, "pos": 6, "placement": 6, "mime_type": "text/plain", "format": "other", "format_desc": "Generate index codes conversion from application/pdf to indexcodes", "language": "en", "security": "public", "license": "other", "main": "indexcodes.txt", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/13363" }, { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/13363" }, { "type": "http://eprints.org/relation/isIndexCodesVersionOf", "uri": "/id/document/13363" } ] } } ], "eprint_status": "archive", "userid": 51, "dir": "disk0/00/00/65/69", "datestamp": "2011-08-24 17:10:04", "lastmod": "2023-12-21 20:00:40", "status_changed": "2011-08-24 17:10:04", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Mason-Peter-Vroman", "name": { "family": "Mason", "given": "Peter Vroman" }, "orcid": "0000-0002-7963-7420", "show_email": "NO" } ] }, "title": "Surface Impedance of Thin Superconducting Films", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Electrical Engineering and Physics)", "abstract": "Theoretical analysis and experimental measurements have been made of the propagation of electromagnetic waves in a structure consisting of two planar superconductors which are of the order of a penetration depth apart. One superconductor is tantalum and is much thicker than a penetration depth; the other is a vacuum evaporated indium film and may be as thin as a penetration depth.
\r\n\r\nIt is shown that such a structure will propagate waves at a phase velocity less than the speed of light in the medium separating the superconductors, a phenomenon that is the result of an inductive component in the surface impedance of the superconductors. The exact velocity is shown to be a function of the thickness parameters in a manner which depends on the law relating the vector potential and the supercurrent in the indium.
\r\n\r\nExperimental measurements indicate that the relationship between vector potential and current in the vacuum evaporated indium is characterized by a coherence distance which is considerably smaller than that found for pure metals by the measurements of Pippard and the theory of Bardeen, Cooper and Schrieffer.
\r\n\r\nThe penetration depth at zero temperature is deduced from dependence of phase velocity on the thicknesses of the indium and dielectric. For indium \u03bb is found to be 650 \u00b1 75\u00c5, in good agreement with Lock's value of 640\u00c5 and Toxen's range from 625 to 725\u00c5. For tantalum \u03bb is found to be 500 \u00b1 175\u00c5. This is believed to be the first measurement. The value of \u03bb for indium is also deduced from the dependence of phase velocity on temperature. It is found to be 704 \u00b1 120\u00c5.
\r\n\r\nSurface resistance of the two superconductors is found to increase \u03c92, in good agreement with theory, and to depend on temperature according to an empirical law proposed by Pippard.
\r\n", "date": "1962", "date_type": "degree", "id_number": "CaltechTHESIS:08032011-113156194", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechTHESIS:08032011-113156194", "related_url": { "items": [ { "description": "Electron Tube and Microwave Laboratory Technical Report 17", "type": "related", "url": "http://resolver.caltech.edu/CaltechAUTHORS:20190318-121824635" } ] }, "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Tony Diaz", "deposited_on": "2011-08-24 17:10:04", "doi": "10.7907/F5XN-7E70", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "email": "rwgould@caltech.edu", "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "review_status": "approved", "option_major": { "items": [ "eleceng" ] }, "option_minor": { "items": [ "physics" ] }, "copyright_statement": "Author's Rights Authorization: I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted here is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive license to archive and make accessible, under the conditions specified under \"Thesis Availability\" in this submission, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation, or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1962", "author_list": "Mason, Peter Vroman", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/3078", "eprint_id": 3078, "rev_number": 17, "documents": [ { "id": "/id/document/5491", "doc_id": 5491, "rev_number": 4, "files": [ { "id": "/id/file/32397", "fileid": 32397, "datasetid": "document", "objectid": 5491, "filename": "Evtuhov_v_1960.pdf", "mime_type": "application/pdf", "filesize": 6141593, "mtime": "2012-12-26 02:56:48", "url": "/3078/1/Evtuhov_v_1960.pdf" } ], "eprint_id": 3078, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "Thesis", "language": "en", "security": "public", "license": "other", "main": "Evtuhov_v_1960.pdf", "media_duration": "0", "media_aspect_ratio": "0", 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"http://eprints.org/relation/isIndexCodesVersionOf", "uri": "/id/document/97237" } ] } } ], "eprint_status": "archive", "userid": 2, "dir": "disk0/00/00/30/78", "datestamp": "2007-08-14", "lastmod": "2023-11-07 17:49:33", "status_changed": "2009-09-25 02:50:58", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Evtuhov-Viktor", "name": { "family": "Evtuhov", "given": "Viktor" }, "show_email": "NO" } ] }, "title": "Theory of the Valence Band Energy Level Structures of Germanium and Silicon in an External Magnetic Field", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Electrical Engineering and Physics)", "note": "Thesis title varies in 1961 Caltech commencement program: Theory of the Valence Band Energy Level Structures of Ge and Si in an External Magnetic Field.", "abstract": "The problem of the valence band structure of Ge and Si in the presence of an external magnetic field is considered from a quantum mechanical point of view. The analysis is carried out using first and second order perturbation theory. The approach is, in principle, similar to that of W. Shockley and E. O. Kane, but is modified in some important essentials to include the effects of the magnetic field. The analytical results obtained are somewhat more general than those of J. M. Luttinger but reduce to the latter if certain approximations are introduced. Numerical calculations of the Landau energy levels are carried out for certain special cases, of which the most important are the following:
\r\n\r\n1. Magnetic field \u03f0 in the [001] direction, kH = 0; nonspherical symmetry character of energy bands and the coupling of V1 and V2 bands to the V3 band included.
\r\n\r\n2. Magnetic field \u03f0 in the [001] direction, kH \u2260 0; nonspherical symmetry character of energy bands included, decoupling of V1 and V2 bands from the V3 band assumed.
\r\n\r\nIn addition, a set of algebraic equations is derived whose solution should yield the valence band Landau levels for the cases of the magnetic field in the [101] and the [111] directions. However, no numerical calculations are performed for these cases.
\r\n\r\nThe results of the calculations indicate the presence of some interesting transitions between the Landau levels of Ge and Si, as well as the possible presence of other interesting effects which may be observable. Certain of these seem to offer potential millimeter-wave applications possibilities, some of which are discussed.
\r\n", "date": "1961", "date_type": "degree", "id_number": "CaltechETD:etd-08092007-144751", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-08092007-144751", "related_url": { "items": [ { "description": "Electron Tube and Microwave Laboratory Technical Report 16", "type": "related", "url": "http://resolver.caltech.edu/CaltechAUTHORS:20190304-180652654" } ] }, "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Office of Naval Research (ONR)", "grant_number": "220(13)" }, { "agency": "Radio Corporation of America" }, { "agency": "Howard Hughes Fellowship in Science and Engineering" } ] }, "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Imported from ETD-db", "deposited_on": "2007-08-14", "doi": "10.7907/ZTF9-GX67", "alt_title": { "items": [ "Theory of the Valence Band Energy Level Structures of Ge and Si in an External Magnetic Field" ] }, "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "email": "rwgould@caltech.edu", "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2007-08-09", "thesis_defense_date": "1960-10-01", "thesis_approved_date": "2007-08-14", "review_status": "approved", "option_major": { "items": [ "eleceng" ] }, "option_minor": { "items": [ "physics" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1961", "author_list": "Evtuhov, Viktor", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/709", "eprint_id": 709, "rev_number": 28, "documents": [ { "id": "/id/document/1073", "doc_id": 1073, "rev_number": 7, "files": [ { "id": "/id/file/6715", "fileid": 6715, "datasetid": "document", "objectid": 1073, "filename": "Forster_dc_1960.pdf", "mime_type": "application/pdf", "filesize": 6672933, "mtime": "2012-12-26 02:31:51", "url": "/709/1/Forster_dc_1960.pdf" } ], "eprint_id": 709, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "language": "en", "security": "public", "license": "other", "main": "Forster_dc_1960.pdf", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", 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"http://eprints.org/relation/isIndexCodesVersionOf", "uri": "/id/document/97173" } ] } } ], "eprint_status": "archive", "userid": 2, "dir": "disk0/00/00/07/09", "datestamp": "2006-03-02", "lastmod": "2023-10-23 22:24:55", "status_changed": "2009-09-25 01:44:37", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Forster-Donald-Charles", "name": { "family": "Forster", "given": "Donald Charles" }, "show_email": "NO" } ] }, "title": "Theory of Parametrically-Pumped Longitudinal-Field Electron Beams", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Electrical Engineering)", "abstract": "The general equations describing electron beams which have been excited by both a moderately strong pump source (or local oscillator) and a weak signal source are formulated in terms of coupled modes, including coupling to slow-wave circuits, and solved numerically for four problems of interest:
\r\n\r\na) space-charge pumped longitudinal parametric amplifiers
\r\n\r\nb) circuit-pumped longitudinal parametric amplifiers
\r\n\r\nc) parametric cooling of slow space-charge waves, and
\r\n\r\nd) traveling-wave tubes with pump space-charge waves excited on the electron stream.
\r\n\r\nEmphasis is placed on the parametric amplifier solutions, and realization of noise temperatures as low as 55\u00b0K are indicated. A discussion of the form of the general equations leads to new concepts about the coupling of positive and negative energy carriers through the action of parametric pumping.
\r\n\r\nExperimental results are presented which tend to verify qualitatively some of the theoretical predictions for the behavior of the parametric amplifiers.
\r\n", "date": "1960", "date_type": "degree", "id_number": "CaltechETD:etd-02222006-091619", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-02222006-091619", "related_url": { "items": [ { "description": "Electron Tube and Microwave Laboratory Technical Report 14", "type": "related", "url": "http://resolver.caltech.edu/CaltechAUTHORS:20190227-175620697" } ] }, "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Howard Hughes Fellowship Program" }, { "agency": "Office of Naval Research (ONR)", "grant_number": "220(13)" } ] }, "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Imported from ETD-db", "deposited_on": "2006-03-02", "doi": "10.7907/WNEA-DF59", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "email": "rwgould@caltech.edu", "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2006-02-22", "thesis_defense_date": "1960-01-01", "thesis_approved_date": "2006-03-02", "review_status": "approved", "option_major": { "items": [ "eleceng" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1960", "author_list": "Forster, Donald Charles", "advisor_list": "Gould, Roy Walter", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/418", "eprint_id": 418, "rev_number": 18, "documents": [ { "id": "/id/document/638", "doc_id": 638, "rev_number": 2, "files": [ { "id": "/id/file/4022", "fileid": 4022, "datasetid": "document", "objectid": 638, "filename": "Boyd_gd_1959.pdf", "mime_type": "application/pdf", "filesize": 4576440, "mtime": "2012-12-26 02:29:43", "url": "/418/1/Boyd_gd_1959.pdf" } ], "eprint_id": 418, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "Boyd_gd_1959.pdf", "language": "en", "security": "public", "license": "other", "main": "Boyd_gd_1959.pdf", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "final", "relation": { "items": [ { "type": "http://eprints.org/relation/hasVolatileVersion", "uri": "/id/document/17464" }, { "type": "http://eprints.org/relation/haspreviewThumbnailVersion", "uri": "/id/document/17464" }, { "type": "http://eprints.org/relation/hasVersion", "uri": "/id/document/17464" } ] } }, { "id": "/id/document/17464", "doc_id": 17464, "rev_number": 2, "files": [ { "id": "/id/file/4020", "fileid": 4020, "datasetid": "document", "objectid": 17464, "filename": "preview.png", "mime_type": "image/png", "hash": "2bce0cf2f2b11ade876970dfe66317a9", "hash_type": "MD5", "filesize": 7516, "mtime": "2012-12-26 02:29:43", "url": "/418/2/preview.png" } ], "eprint_id": 418, "pos": 2, "placement": 2, "mime_type": "image/png", "format": "image/png", "language": "en", "security": "public", "license": "other", "main": "preview.png", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/638" }, { "type": "http://eprints.org/relation/ispreviewThumbnailVersionOf", "uri": "/id/document/638" }, { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/638" } ] } } ], "eprint_status": "archive", "userid": 2, "dir": "disk0/00/00/04/18", "datestamp": "2006-01-31", "lastmod": "2023-10-19 22:05:57", "status_changed": "2009-09-25 01:37:08", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Boyd-Gary-Delane", "name": { "family": "Boyd", "given": "Gary Delane" }, "show_email": "NO" } ] }, "title": "Experiments on the Interaction of a Modulated Electron Beam with a Plasma", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Electrical Engineering and Physics)", "abstract": "New experiments are performed concerning the high frequency interactions of electron beams and plasmas. A modulated (500 Mc and 3000 Mc) electron beam is passed through a uniform plasma region of a mercury arc discharge, after which it is demodulated. Exponentially growing wave amplification along the electron beam is observed for the first time at a modulation frequency equal to the plasma frequency. No constant magnetic fields are used in these experiments. Calculations based on the one dimensional analysis of Bohm and Gross of an electron beam passing through a plasma are made to predict the effects of the random energy of the plasma electrons and collisions. By studying the interaction of a finite diameter beam and a plasma with no thermals or collisions, it is shown that the effect of the finite geometry is to reduce the growth constant.
\r\n\r\nRecent work by Trivelpiece and Gould has pointed out that a plasma column in free space may propagate forward and backward waves at a velocity small compared to the velocity of light. The experimental techniques of passing a modulated electron beam through the plasma, as described above, are applied to observe traveling wave type of interaction with the slow wave mode of propagation in the absence of any magnetic fields. Theory predicting experimental rates of growth is presented. Experimental results in good agreement with theory are presented.
\r\n\r\nIn the course of verifying plasma density measurements, the excitation of the dipole resonance of a plasma column is considered. Multiple resonances are observed and discussed.
", "date": "1959", "date_type": "degree", "id_number": "CaltechETD:etd-01312006-141144", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-01312006-141144", "related_url": { "items": [ { "description": "Electron Tube and Microwave Laboratory Technical Report 11", "type": "related", "url": "http://resolver.caltech.edu/CaltechAUTHORS:20190225-185535183" }, { "description": "Electron Tube and Microwave Laboratory Technical Report 18", "type": "related", "url": "http://resolver.caltech.edu/CaltechAUTHORS:BOYprocire61" } ] }, "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Office of Naval Research (ONR)", "grant_number": "220(13)" } ] }, "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Imported from ETD-db", "deposited_on": "2006-01-31", "doi": "10.7907/JAAT-0J83", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "email": "rwgould@caltech.edu", "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" }, { "id": "Field-L-M", "name": { "family": "Field", "given": "Lester M." }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2006-01-31", "thesis_defense_date": "1959-01-01", "thesis_approved_date": "2006-01-31", "review_status": "approved", "option_major": { "items": [ "eleceng" ] }, "option_minor": { "items": [ "physics" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1959", "author_list": "Boyd, Gary Delane", "advisor_list": "Gould, Roy Walter and Field, Lester M.", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/152", "eprint_id": 152, "rev_number": 10, "documents": [ { "id": "/id/document/242", "doc_id": 242, "rev_number": 2, "files": [ { "id": "/id/file/1507", "fileid": 1507, "datasetid": "document", "objectid": 242, "filename": "Sedin_jw_1958.pdf", "mime_type": "application/pdf", "filesize": 4814851, "mtime": "2012-12-26 02:27:41", "url": "/152/1/Sedin_jw_1958.pdf" } ], "eprint_id": 152, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "Sedin_jw_1958.pdf", "language": "en", "security": "public", "license": "other", "main": "Sedin_jw_1958.pdf", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "final", "relation": { "items": [ { "type": "http://eprints.org/relation/hasVolatileVersion", "uri": "/id/document/17067" }, { "type": "http://eprints.org/relation/haspreviewThumbnailVersion", "uri": "/id/document/17067" }, { "type": "http://eprints.org/relation/hasVersion", "uri": "/id/document/17067" } ] } }, { "id": "/id/document/17067", "doc_id": 17067, "rev_number": 2, "files": [ { "id": "/id/file/1505", "fileid": 1505, "datasetid": "document", "objectid": 17067, "filename": "preview.png", "mime_type": "image/png", "hash": "05c036be2be52d7119604520f0fe99fb", "hash_type": "MD5", "filesize": 8941, "mtime": "2012-12-26 02:27:41", "url": "/152/2/preview.png" } ], "eprint_id": 152, "pos": 2, "placement": 2, "mime_type": "image/png", "format": "image/png", "language": "en", "security": "public", "license": "other", "main": "preview.png", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/242" }, { "type": "http://eprints.org/relation/ispreviewThumbnailVersionOf", "uri": "/id/document/242" }, { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/242" } ] } } ], "eprint_status": "archive", "userid": 2, "dir": "disk0/00/00/01/52", "datestamp": "2006-01-13", "lastmod": "2023-10-17 21:13:34", "status_changed": "2009-09-25 01:29:46", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Sedin-James-Walter", "name": { "family": "Sedin", "given": "James Walter" }, "show_email": "NO" } ] }, "title": "A Large-Signal Analysis of Beam-Type Crossed-Field Traveling-Wave Tubes", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Electrical Engineering and Physics)", "note": "Title varies in the 1958 Caltech commencement program: A Large-Signal Analysis of Beam-Type Cross-Field Traveling-Wave\r\nTubes", "abstract": "The equations governing the behavior of beam-type, crossed-field, traveling-wave tubes are formulated and presented. The geometry is assumed to be two-dimensional. The electron beam is treated as a number of cylinders of charge (it can be regarded as a number of layers of pencils the axes of which are parallel; these pencils can move in the two dimensions perpendicular to their axes) and space-charge forces are included by calculating the field due to these cylinders when they are placed between two perfectly conducting planes. The nonlinear equations are re-expressed in terms of normalized variables suitable for machine computation, and the procedure for solving these equations numerically is discussed. The equations are solved for a number of thin-beam, small-signal cases and the results are compared with previous analytical work. Numerical difficulties are encountered because the electric field approaches infinity in the neighborhood of a line charge. These difficulties are circumvented by a modification of the electric field in the vicinity of a line charge. Large-signal calculations are carried out for the special case of a thin sheet beam which would travel in a straight line in the absence of r-f effects. The computations are carried out for both forward- and backward-wave interaction by using several values of a space-charge parameter that cover typical operating conditions.", "date": "1958", "date_type": "degree", "id_number": "CaltechETD:etd-01132006-083726", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-01132006-083726", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Imported from ETD-db", "deposited_on": "2006-01-13", "doi": "10.7907/5MN5-D881", "alt_title": { "items": [ "Large-Signal Analysis of Beam-Type Cross-Field Traveling-Wave Tubes" ] }, "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" }, { "id": "Field-L-M", "name": { "family": "Field", "given": "Lester M." }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2006-01-13", "thesis_defense_date": "1958-01-01", "thesis_approved_date": "2006-01-13", "review_status": "approved", "option_major": { "items": [ "eleceng" ] }, "option_minor": { "items": [ "physics" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1958", "author_list": "Sedin, James Walter", "advisor_list": "Gould, Roy Walter and Field, Lester M.", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/2799", "eprint_id": 2799, "rev_number": 15, "documents": [ { "id": "/id/document/5133", "doc_id": 5133, "rev_number": 2, "files": [ { "id": "/id/file/29991", "fileid": 29991, "datasetid": "document", "objectid": 5133, "filename": "Trivelpiece_aw_1958.pdf", "mime_type": "application/pdf", "filesize": 5382201, "mtime": "2012-12-26 02:54:33", "url": "/2799/1/Trivelpiece_aw_1958.pdf" } ], "eprint_id": 2799, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "Trivelpiece_aw_1958.pdf", "language": "en", "security": "public", "license": "other", "main": "Trivelpiece_aw_1958.pdf", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "final", "relation": { "items": [ { "type": "http://eprints.org/relation/hasVolatileVersion", "uri": "/id/document/21685" }, { "type": "http://eprints.org/relation/haspreviewThumbnailVersion", "uri": "/id/document/21685" }, { "type": "http://eprints.org/relation/hasVersion", "uri": "/id/document/21685" } ] } }, { "id": "/id/document/21685", "doc_id": 21685, "rev_number": 2, "files": [ { "id": "/id/file/29989", "fileid": 29989, "datasetid": "document", "objectid": 21685, "filename": "preview.png", "mime_type": "image/png", "hash": "64919c838beba43bc4ee49aa603c3757", "hash_type": "MD5", "filesize": 6563, "mtime": "2012-12-26 02:54:33", "url": "/2799/2/preview.png" } ], "eprint_id": 2799, "pos": 2, "placement": 2, "mime_type": "image/png", "format": "image/png", "language": "en", "security": "public", "license": "other", "main": "preview.png", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/5133" }, { "type": "http://eprints.org/relation/ispreviewThumbnailVersionOf", "uri": "/id/document/5133" }, { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/5133" } ] } } ], "eprint_status": "archive", "userid": 2, "dir": "disk0/00/00/27/99", "datestamp": "2004-07-02", "lastmod": "2023-10-17 16:52:12", "status_changed": "2009-09-25 02:45:07", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Trivelpiece-Alvin-William", "name": { "family": "Trivelpiece", "given": "Alvin William" }, "show_email": "NO" } ] }, "title": "Slow Wave Propagation in Plasma Waveguides", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Electrical Engineering and Physics)", "abstract": "It is shown that the space charge wave modes of propagation which are usually associated with the drifting motion of an electron beam can also propagate and carry energy in stationary electron beams or plasmas of finite transverse cross section. The properties of these modes of propagation have been studied by considering the plasma as a dielectric and solving the field equations. The effect of d.c. magnetic fields have been included, while ion motion and thermal velocities have been neglected. These modes have phase velocities which are generally much less than the velocity of light. Two distinct types of propagation are reported; the first involves charge density variation within the plasma (body wave) and the second involves a perturbation of the surface of the plasma (surface wave). Both of these types have modes which exist down to zero frequency as well as backward wave modes. The angular dependent modes can exhibit Faraday rotation.\r\n\r\nOne of the potentially useful features of these modes of propagation is that of plasma diagnostics. The effect of radial charge density variation within the plasma column has been investigated and methods for experimentally determining this variation, as well as the average charge density, are suggested. The effect of collisions on wave attenuation is examined approximately.\r\n\r\nThe interaction of a moving electron beam with these modes is considered, as well as the backward wave start oscillation conditions for backward wave interaction. A qualitative explanation of these modes is given in terms of an equivalent electrical circuit transmission line. Many of the features of these modes have been verified experimentally by measuring the phase velocity along a mercury arc discharge column in an axial magnetic field.\r\n", "date": "1958", "date_type": "degree", "id_number": "CaltechETD:etd-07012004-112216", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-07012004-112216", "related_url": { "items": [ { "description": "Technical Report", "type": "related", "url": "http://resolver.caltech.edu/CaltechAUTHORS:20190220-181008996" } ] }, "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Imported from ETD-db", "deposited_on": "2004-07-02", "doi": "10.7907/WNSZ-2Y08", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" }, { "id": "Field-L-M", "name": { "family": "Field", "given": "Lester M." }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2004-07-01", "thesis_defense_date": "1958-01-01", "thesis_approved_date": "2004-07-02", "review_status": "approved", "option_major": { "items": [ "eleceng" ] }, "option_minor": { "items": [ "physics" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1958", "author_list": "Trivelpiece, Alvin William", "advisor_list": "Gould, Roy Walter and Field, Lester M.", "comittee_list": "Unknown, Unknown" }, { "id": "https://thesis.library.caltech.edu/id/eprint/996", "eprint_id": 996, "rev_number": 11, "documents": [ { "id": "/id/document/1546", "doc_id": 1546, "rev_number": 2, "files": [ { "id": "/id/file/9589", "fileid": 9589, "datasetid": "document", "objectid": 1546, "filename": "Buchman_w_1956.pdf", "mime_type": "application/pdf", "filesize": 9096271, "mtime": "2012-12-26 02:34:27", "url": "/996/1/Buchman_w_1956.pdf" } ], "eprint_id": 996, "pos": 1, "mime_type": "application/pdf", "format": "application/pdf", "format_desc": "Buchman_w_1956.pdf", "language": "en", "security": "public", "license": "other", "main": "Buchman_w_1956.pdf", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "content": "final", "relation": { "items": [ { "type": "http://eprints.org/relation/hasVolatileVersion", "uri": "/id/document/18327" }, { "type": "http://eprints.org/relation/haspreviewThumbnailVersion", "uri": "/id/document/18327" }, { "type": "http://eprints.org/relation/hasVersion", "uri": "/id/document/18327" } ] } }, { "id": "/id/document/18327", "doc_id": 18327, "rev_number": 2, "files": [ { "id": "/id/file/9587", "fileid": 9587, "datasetid": "document", "objectid": 18327, "filename": "preview.png", "mime_type": "image/png", "hash": "8c2f6e0f80e45f46113ea4a029687746", "hash_type": "MD5", "filesize": 8975, "mtime": "2012-12-26 02:34:27", "url": "/996/2/preview.png" } ], "eprint_id": 996, "pos": 2, "placement": 2, "mime_type": "image/png", "format": "image/png", "language": "en", "security": "public", "license": "other", "main": "preview.png", "media_duration": "0", "media_aspect_ratio": "0", "media_sample_start": "0", "media_sample_stop": "0", "relation": { "items": [ { "type": "http://eprints.org/relation/isVolatileVersionOf", "uri": "/id/document/1546" }, { "type": "http://eprints.org/relation/ispreviewThumbnailVersionOf", "uri": "/id/document/1546" }, { "type": "http://eprints.org/relation/isVersionOf", "uri": "/id/document/1546" } ] } } ], "eprint_status": "archive", "userid": 2, "dir": "disk0/00/00/09/96", "datestamp": "2004-03-19", "lastmod": "2023-07-10 22:58:22", "status_changed": "2009-09-25 01:52:29", "type": "thesis", "metadata_visibility": "show", "creators": { "items": [ { "id": "Buchman-William-W", "name": { "family": "Buchman", "given": "William W." }, "show_email": "NO" } ] }, "title": "Field Theory of Travelling-Wave with Loss: Application to the Study of Attenuator Saturation Effects", "ispublished": "unpub", "full_text_status": "public", "keywords": "(Electrical Engineering, Physics and Mathematics)", "abstract": "NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.\r\n\r\nPropagation constants have been calculated for a lossy traveling-wave tube by means of a field theory. These results have been applied to the prediction of an attenuator power loss of the order of 2 or 3 db. compared to attenuatorless operation. It is shown that the gain of the higher order modes is negligible. Admittance matching by means of radial admittance transformation is the underlying method used throughout.\r\n\r\nThe Pierce-Fletcher theory in common use at this time is examined in some detail to determine its range of validity. It is found to break down when the ratio of beam to helix radius is almost unity and when [...] is small. Furthermore, it is shown that complex parameters must replace the real ones, Q, K, and C, if one wants to extend the Pierce notation correctly to lossy tubes. Not doing so leads to discrepancies of approximately 10% in the propagation constants calculated here. There is reason to believe that parameters other than those used here will not result in greater discrepancy.\r\n\r\nThe effects of space charge bunching on saturation has been treated. Criteria have been set for determining whether bunching is important or not in determining saturation.", "date": "1956", "date_type": "degree", "id_number": "CaltechETD:etd-03182004-155923", "refereed": "FALSE", "official_url": "https://resolver.caltech.edu/CaltechETD:etd-03182004-155923", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechTHESIS", "reviewer": "Kathy Johnson", "deposited_by": "Imported from ETD-db", "deposited_on": "2004-03-19", "doi": "10.7907/F74C-PD63", "divisions": { "items": [ "div_eng" ] }, "institution": "California Institute of Technology", "thesis_type": "phd", "thesis_advisor": { "items": [ { "id": "Field-L-M", "name": { "family": "Field", "given": "Lester M." }, "role": "advisor" }, { "id": "Gould-R-W", "name": { "family": "Gould", "given": "Roy Walter" }, "role": "advisor" } ] }, "thesis_committee": { "items": [ { "name": { "family": "Unknown", "given": "Unknown" } } ] }, "thesis_degree": "PHD", "thesis_degree_grantor": "California Institute of Technology", "thesis_submitted_date": "2004-03-18", "thesis_defense_date": "1956-01-01", "thesis_approved_date": "2004-03-19", "review_status": "approved", "option_major": { "items": [ "eleceng" ] }, "option_minor": { "items": [ "math", "physics" ] }, "copyright_statement": "I hereby certify that, if appropriate, I have obtained a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee.\n\nI hereby grant to California Institute of Technology or its agents the non-exclusive\nlicense to archive and make accessible, under the conditions specified below,\nmy thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.", "resource_type": "thesis", "pub_year": "1956", "author_list": "Buchman, William W.", "advisor_list": "Field, Lester M. and Gould, Roy Walter", "comittee_list": "Unknown, Unknown" } ]