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Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)最新文献

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Analysis of resonance frequencies and inherent Q-factors of a spatially developed partially filled cylindrical resonator 空间发展部分填充圆柱谐振腔的谐振频率和固有q因子分析
Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999301
V. Naidenko, H. Borsch
{"title":"Analysis of resonance frequencies and inherent Q-factors of a spatially developed partially filled cylindrical resonator","authors":"V. Naidenko, H. Borsch","doi":"10.1109/IVELEC.2002.999301","DOIUrl":"https://doi.org/10.1109/IVELEC.2002.999301","url":null,"abstract":"By mode matching technique a problem of calculation of resonance frequencies and inherent Q-factors of a cylindrical resonator with final conductivity of walls loaded by a system of periodically placed cylindrical dielectric samples of arbitrary complex scalar permittivity and a height, equal to the height of the resonator, has been solved.","PeriodicalId":344852,"journal":{"name":"Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114702404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental study on Ka-band harmonic-multiplying two-stage tapered gyro-TWT ka波段倍频两级锥形陀螺行波管的实验研究
Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999425
C. Baik, S. Jeon, D. Kim, A. Ganguly, J.J. Choi, G. Park, N. Sato, K. Yokoo
{"title":"Experimental study on Ka-band harmonic-multiplying two-stage tapered gyro-TWT","authors":"C. Baik, S. Jeon, D. Kim, A. Ganguly, J.J. Choi, G. Park, N. Sato, K. Yokoo","doi":"10.1109/IVELEC.2002.999425","DOIUrl":"https://doi.org/10.1109/IVELEC.2002.999425","url":null,"abstract":"Summary form only given. An experimental setup of two-stage tapered harmonic multiplying gyrotron traveling-wave tube is being prepared to achieve high power millimeter waves. X-band input frequencies can be multiplied and amplified by the interaction at the 3/sup rd/ harmonic of electron cyclotron frequencies with practical, inexpensive, low frequency driving sources. The required magnetic field can be also reduced to one-third of the magnetic field at the fundamental harmonic interaction. To suppress unwanted oscillations, a linearly tapered two-stage rectangular waveguide at the fundamental TE/sub 10/ mode is used at the expense of low coupling between RF waves and electrons. A previous experimental demonstration at NRL showed a 20% bandwidth at saturated gain of 25 dB with 16% efficiency when the predicted velocity spreads of 4% are assumed at the fundamental harmonic interaction of Ka-band. In this study, however, under the 3/sup rd/ harmonic multiplying interactions, a self-consistent nonlinear calculation shows a saturated gain of 23 dB, an electronic efficiency of 10%, and a bandwidth of 3% on the assumption of 4% axial velocity spreads of electrons when an axis-encircling electron beam at a moderate beam voltage of 30 kV and a current of 1 A is employed.","PeriodicalId":344852,"journal":{"name":"Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128600049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High perveance TWT modeling and experimental verification 高性能行波管建模与实验验证
Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999419
D. Whaley, C. Armstrong, M. Barsanti, T. Hargreaves, J. Mckay, A. Theiss, R. True, D. Smithe, D. Chernin, T. Antonsen, B. Levush
{"title":"High perveance TWT modeling and experimental verification","authors":"D. Whaley, C. Armstrong, M. Barsanti, T. Hargreaves, J. Mckay, A. Theiss, R. True, D. Smithe, D. Chernin, T. Antonsen, B. Levush","doi":"10.1109/IVELEC.2002.999419","DOIUrl":"https://doi.org/10.1109/IVELEC.2002.999419","url":null,"abstract":"The modeling and design of high perveance TWTs present significant challenges when one considers the role that space charge plays in all aspects of gun design, beam propagation and focus, RF interaction, and beam recollection. Some applications require the use of low voltage, high current electron beams which in turn require special analysis and design techniques not always required by lower perveance devices. This work shows that accurate RF simulation of high perveance TWTs, even in a highly scalloping configuration, can be accomplished through the combined use of several modem TWT design tools. Studies of efficient recollection of the high-space-charge spent beam and evaluation of backward wave and diocotron instabilities is ongoing and will be important in the overall evaluation of this TWT design. RF modeling results and a full set of experimental data are presented.","PeriodicalId":344852,"journal":{"name":"Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133290617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Advanced high thermal conductivity ceramics for power microwave tubes 用于功率微波管的先进高导热陶瓷
Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999248
G. Xu, Y. Carmel, I. Lloyd, O. Wilson, T. Olorunyolemi
{"title":"Advanced high thermal conductivity ceramics for power microwave tubes","authors":"G. Xu, Y. Carmel, I. Lloyd, O. Wilson, T. Olorunyolemi","doi":"10.1109/IVELEC.2002.999248","DOIUrl":"https://doi.org/10.1109/IVELEC.2002.999248","url":null,"abstract":"Summary form only given. Microwave sintering approaches have been used to develop a family of AlN based composites that exhibit superior thermal conductivities and tailored dielectric losses. These materials are needed to replace toxic BeO-based composites for power microwave tube applications. Our activities concentrated on the improvement of thermal conductivity, dielectric and mechanical properties (hardness and toughness) of various aluminum nitride composites. Single phase, polycrystalline AlN with thermal conductivity up to 224 W/mK and dielectric loss of tan /spl delta/=0.01 was achieved by controlled microwave processing. The addition of controlled amounts of TiB/sub 2/ and SiC increased the dielectric losses while maintaining relatively high thermal conductivity values. These advanced AlN based composites can be used in power microwave tubes for suppression of mode competition in cavities, support helices in TWTs, and for microwave windows.","PeriodicalId":344852,"journal":{"name":"Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126871308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Heavily-loaded wideband helix traveling wave tube 重载宽带螺旋行波管
Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999254
Y. Joo, Sungyung Jung, Jung-Il Kim, Seung-Tae Han, C. Baik, S. Jeon, B. Jia, H. Kim, H. Uhm, G. Park
{"title":"Heavily-loaded wideband helix traveling wave tube","authors":"Y. Joo, Sungyung Jung, Jung-Il Kim, Seung-Tae Han, C. Baik, S. Jeon, B. Jia, H. Kim, H. Uhm, G. Park","doi":"10.1109/IVELEC.2002.999254","DOIUrl":"https://doi.org/10.1109/IVELEC.2002.999254","url":null,"abstract":"The experimental work for a wideband (6-18GHz) helix TWT with a heavy ceramic loading has been carried out at SNU. The well known issues of this kind of TWT are the maximum allowed 2/sup nd/ harmonic level at the lower frequency range and minimum allowed efficiency at the higher frequency range. The \"negative\" dispersion of a helical slow-wave structure (SWS) is a key concept to ensure a successful operation in wideband helix TWT. In this study, an unconventional \"positive phase-velocity-tapering\" with an unequal ceramic rod was employed to enhance the second harmonic level at the lower frequencies and efficiency at the higher frequencies. The dispersion and the interaction impedance of the structure were predicted by a 3-D HFSS code.","PeriodicalId":344852,"journal":{"name":"Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124774130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
3-D simulation of hollow-beam helix TWTs 空心束螺旋行波管的三维仿真
Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999238
D. Smithe, A. Theiss
{"title":"3-D simulation of hollow-beam helix TWTs","authors":"D. Smithe, A. Theiss","doi":"10.1109/IVELEC.2002.999238","DOIUrl":"https://doi.org/10.1109/IVELEC.2002.999238","url":null,"abstract":"We present physics studies of hollow-beam helix TWTs using 3D particle-in-cell simulation methods. Modern desktop computing power now permits us to perform true-geometry simulation of the helix slow-wave device with near-realistic tube length, although with course resolution of the helix wire element. One important benefit of true-geometry simulation is the implicit inclusion of the strong backward-wave physics at a wavelength corresponding to twice the pitch. These 3-D simulations are intended to verify and calibrate this and other known 3-D TWT behavior.","PeriodicalId":344852,"journal":{"name":"Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130329722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The helical slow-wave structures with a varying law of the winding for application in satellite TWT 具有变绕线规律的螺旋慢波结构在卫星行波管中的应用
Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999304
A. A. Kurayev, A. K. Sinitsyn
{"title":"The helical slow-wave structures with a varying law of the winding for application in satellite TWT","authors":"A. A. Kurayev, A. K. Sinitsyn","doi":"10.1109/IVELEC.2002.999304","DOIUrl":"https://doi.org/10.1109/IVELEC.2002.999304","url":null,"abstract":"The excitation equations for the irregular helical waveguide are obtained on the basis of conversion of coordinates and with using Galerkin's projection technique.","PeriodicalId":344852,"journal":{"name":"Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129940825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Non-traditional microwave electronics based on electron beam transverse waves use 非传统微波电子学基于电子束横波的使用
Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999334
V. Vanke
{"title":"Non-traditional microwave electronics based on electron beam transverse waves use","authors":"V. Vanke","doi":"10.1109/IVELEC.2002.999334","DOIUrl":"https://doi.org/10.1109/IVELEC.2002.999334","url":null,"abstract":"This report includes the discussion of the physics principles and technology of the following non-traditional devices: cyclotron wave protectors, low-noise cyclotron wave parametric amplifiers and cyclotron wave electrostatic amplifiers, narrow-band controlled CWESA-filters, high power circularly polarized travelling wave tubes, high power cyclotron wave converters; klystrons with combined interaction; cyclotron wave phase shifters.","PeriodicalId":344852,"journal":{"name":"Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129547909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Characterization of field emitter arrays operating in a traveling wave tube amplifier 在行波管放大器中工作的场发射阵列的特性
Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999324
D. Whaley, B. Gannon, K. Kreischer, V. Heinen, C. Armstrong
{"title":"Characterization of field emitter arrays operating in a traveling wave tube amplifier","authors":"D. Whaley, B. Gannon, K. Kreischer, V. Heinen, C. Armstrong","doi":"10.1109/IVELEC.2002.999324","DOIUrl":"https://doi.org/10.1109/IVELEC.2002.999324","url":null,"abstract":"Field emitter arrays have shown promise to become a viable electron source for RF vacuum devices, as a replacement of thermionic emitters used almost exclusively to date. Recent results at Northrop Grumman show unmodulated FEA operation in a TWT to over 90 mA and 55 W of RF power at 5 GHz as well as emission-gated operation at 5 mA and 280 mW with the emitted beam RF-modulated at up to 7 GHz. This emission-gated operation demonstrated high levels of modulation with peak-to-average current ratios as high as 1.3. Furthermore, cold measurements of RF coupling to the FEA cathode show that modulation up to and above 20 GHz might be achievable.","PeriodicalId":344852,"journal":{"name":"Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128920461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Traveling wave gyrotron with double mode operations 双模式操作的行波回旋管
Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999289
S. Kolosov, A. Kurayev, A. A. Lavrenov
{"title":"Traveling wave gyrotron with double mode operations","authors":"S. Kolosov, A. Kurayev, A. A. Lavrenov","doi":"10.1109/IVELEC.2002.999289","DOIUrl":"https://doi.org/10.1109/IVELEC.2002.999289","url":null,"abstract":"Kinematics theory is formulated. The traveling wave gyrotron (TWG) at interaction with a previously rectilinear relativistic electron beam (REB) with connected E/sub 11/ and H/sub 11/ waves of a goffered waveguide has been investigated. It was shown that a TWG with thin REB has a mechanism which is independent from the initial electron input phase that allows prediction of the high efficiency of the device, which is nearing 100%. It is revealed that outlying electrons of a wide REB in a TWG have a combined Cherenkov-gyrotron type of interaction with waves E/sub 11/ and H/sub 11/, since the efficiency of a TWG with wide REB is much higher than in resonance gyrotrons.","PeriodicalId":344852,"journal":{"name":"Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129222103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
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