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4th IEEE International Conference on Vacuum Electronics, 2003最新文献

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Linear TWT with feedforward linearizing circuit 带前馈线性化电路的线性行波管
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286359
Min Ho Son, J. Joo, Y. Na, J. Choi
{"title":"Linear TWT with feedforward linearizing circuit","authors":"Min Ho Son, J. Joo, Y. Na, J. Choi","doi":"10.1109/IVEC.2003.1286359","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286359","url":null,"abstract":"The travelling wave tube has great potential to provide high power for wireless communication. However, its poor linearity has limited its application. This paper describes a feedforward linear technology for improving a TWT linearity where a dual loop is implemented in order to reduce IMD components of the TWT. A low gain, X-band helix-TWT is designed by the use of the Pierce theory and nonlinear numerical simulations codes.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124246231","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
Quantum correction factor for thermionic emission 热离子发射的量子校正因子
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286116
Ming-Chieh Lin, D. Chuu
{"title":"Quantum correction factor for thermionic emission","authors":"Ming-Chieh Lin, D. Chuu","doi":"10.1109/IVEC.2003.1286116","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286116","url":null,"abstract":"Thermionic emission cathodes are widely used in microwave tubes. In this paper, we study theoretically about the quantum correction factor for thermionic emission. The calculated quantum correction factor nearly ranges from 0.2 to 0.5 depending on the work function and the operating temperature of cathode materials.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123233253","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
Modeling of a multistage collector for a high efficiency space TWT 高效空间行波管多级集热器的建模
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286101
T. Ghosh, R. Carter, A. Bera, V. Srivastava, S. Joshi
{"title":"Modeling of a multistage collector for a high efficiency space TWT","authors":"T. Ghosh, R. Carter, A. Bera, V. Srivastava, S. Joshi","doi":"10.1109/IVEC.2003.1286101","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286101","url":null,"abstract":"Two-dimensional package EGUN was used for the simulation of multistage collector. Based on this package a pre- and a post-processor have been developed which make the package user friendly and analyses the performance of the collector. In this article, we modelled the multistage collector for high efficiency space TWT.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"27 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114030392","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
Implementation of a TE/sub 0n/ mode-converter in MAGY for gyrotrons 在MAGY中用于回旋管的TE/sub - 0n/模式转换器的实现
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286202
Y. Miao, T. Antonsen, A. Vlasov, H. Guo, V. Granatstein
{"title":"Implementation of a TE/sub 0n/ mode-converter in MAGY for gyrotrons","authors":"Y. Miao, T. Antonsen, A. Vlasov, H. Guo, V. Granatstein","doi":"10.1109/IVEC.2003.1286202","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286202","url":null,"abstract":"This paper describes the formalism used to delineate the modes in the TE/sub 0n/ mode-converter structure, and the technique used to incorporate the asymmetric fields into MAGY. The formulation requires representation of the fields in a superposition of modes of the vaned structure. These modes are calculated quasi-analytically and incorporated in MAGY. The cut-off wavenumbers for different mode in a TE/sub 01/ to TE/sub 02/ mode-converter from both our quasi-analytic model and HFSS simulation. The modified MAGY can then be used to calculate the scattering matrix for the converter which then be compared with HFSS simulations.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121739424","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
Influence of anode-cathode gap distance on output characteristics of high power microwave from coaxial virtual cathode oscillator 阳极阴极间隙距离对同轴虚阴极振荡器高功率微波输出特性的影响
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286227
K. Y. Sung, W. Jeon, S. H. Chun, K. B. Song, Y. Jung, M. C. Choi, Y. Seo, E. Choi, H. Uhm
{"title":"Influence of anode-cathode gap distance on output characteristics of high power microwave from coaxial virtual cathode oscillator","authors":"K. Y. Sung, W. Jeon, S. H. Chun, K. B. Song, Y. Jung, M. C. Choi, Y. Seo, E. Choi, H. Uhm","doi":"10.1109/IVEC.2003.1286227","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286227","url":null,"abstract":"We have investigated an influence of anode-cathode (A-K) gap distance on output characteristics of high power microwave from coaxial virtual cathode oscillator (vircator). This high power microwave generator is powered by the 'Chundoong' (Max 600 kV, 88 kA, 60 ns), which is an intense relativistic electron beam-pulse generator. In this experiment, we observed that the microwave power has been dependent upon the A-K gap distance, where A-K gap has been varied from 4 mm to 10 mm. The maximum microwave power is observed to be 240 MW, whose efficiency is about 3.45%, at the AK gap distance of 4 mm. Also the microwave frequencies are measured to be 5.7 GHz from combination of coupled line band pass filter with 1 GHz band-gap and dispersive delay line. It is noted that and this measured frequency is in good agreement with that of simulation. It is also found that the dominant mode of output microwave is a TM01 mode from both results of experiment and simulation.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"605 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132052184","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
A gigahertz-bandwidth vector signal generation and analysis system for traveling-wave tube amplifiers testing 一种用于行波管放大器测试的千兆赫带宽矢量信号生成与分析系统
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286048
J. Qiu, D. Abe, T. Antonsen, B. Danly, B. Levush
{"title":"A gigahertz-bandwidth vector signal generation and analysis system for traveling-wave tube amplifiers testing","authors":"J. Qiu, D. Abe, T. Antonsen, B. Danly, B. Levush","doi":"10.1109/IVEC.2003.1286048","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286048","url":null,"abstract":"The calibration procedure for a vector signal system which has over 1.6 GHz of RF bandwidth is described. To achieve the desired bandwidth, two software filters (a prefilter and a postfilter) are used to correct the non-uniform frequency responses in the system. We describe techniques for obtaining the response functions of both the signal generator and the signal analyzer. The measured response functions are used to construct the filters to achieve the flat frequency response. Finally a 1-Gsymbol/s 32-QAM raised-cosine-filtered waveform is generated to demonstrate the application of the system.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132130092","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
Injection schemes for TWT linearization 行波管线性化的注入方案
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286076
Aarti Singh, J. Wohlbier, J. Scharer, J. Booske
{"title":"Injection schemes for TWT linearization","authors":"Aarti Singh, J. Wohlbier, J. Scharer, J. Booske","doi":"10.1109/IVEC.2003.1286076","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286076","url":null,"abstract":"In this paper we investigate various linearization schemes based on signal injection to condition the output spectra. We focus primarily on IM3 (third-order intermodulation) suppression for two-tone drive since the IM3s, being closest to the fundamentals, are the main concern in a communication system. Two primary techniques investigated are second harmonic injection and IM3 injection. These involve injecting amplitude and phase optimized harmonic and IM3 signal respectively, to suppress the inherently generated IM3 at the output of the TWT. We also propose a scheme based on simultaneous injection of both second harmonic and IM3 that offers the prospect of eliminating the need for precise phase control of the former two schemes.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132345542","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: 5
Experimental investigation of millimeter wave folded-waveguide TWT 毫米波折叠波导行波管的实验研究
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286349
S.T. Han, J.I. Kim, K. H. Jang, J. So, S.S. Chang, N. Ryskin, G. Park
{"title":"Experimental investigation of millimeter wave folded-waveguide TWT","authors":"S.T. Han, J.I. Kim, K. H. Jang, J. So, S.S. Chang, N. Ryskin, G. Park","doi":"10.1109/IVEC.2003.1286349","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286349","url":null,"abstract":"Folded-waveguide traveling-wave tube (FWTWT) is one of the candidates for high power, broad-band robust millimeter wave sources. The FWTWT has no periodic reactive load. Therefore, the dispersion relation of space harmonics is estimated by simple transform of that of rectangular waveguide. The folded waveguide circuits are designed and fabricated using 12 kV, 150 mA linear electron beam for Ka-band amplifier and oscillator based on the synthesis process. Solenoid focusing system and pulsed electron beam are used to investigate basic properties of FWTWT in the laboratory. Non-stationary beam-wave interactions performance are investigated by MAGIC3D, and one-dimensional code. From initial folded-waveguide BWO experiment, about 20-watt output power at 35 GHz is obtained with 6% linear tunability. The LIGA fabrication is in process for the operation at the higher frequency.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130925255","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: 7
MPM as a enabling technology for a major product upgrade: the ALQ-162 pulse Doppler/PowerPlus Program MPM作为主要产品升级的使能技术:ALQ-162脉冲多普勒/PowerPlus计划
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286326
M. Basten, J. Perkins, M. Rein, J. Duthie
{"title":"MPM as a enabling technology for a major product upgrade: the ALQ-162 pulse Doppler/PowerPlus Program","authors":"M. Basten, J. Perkins, M. Rein, J. Duthie","doi":"10.1109/IVEC.2003.1286326","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286326","url":null,"abstract":"In this paper, we discuss about the MPM (Microwave Power Module) technology and vacuum power booster components of the PowerPlus upgrade. One example is the Pulse Doppler/PowerPlus upgrade to the ALQ-162 RF countermeasures system. The new, more efficient MPM based approach is capable of providing over twice the RF output power of the original TWTA with no impact to prime power or cooling requirements, and with the same form factor and weight. In the upgraded system a pulse-Doppler capability is added and increased output power is provided in order to increase jamming effectiveness of the system.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132780150","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
W-Band gyroklystron for high power RF applications 高功率射频应用的w波段回旋速调管
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286376
J. Neilson, L. Ives, M. Read, M. Mizuhara, D. Marsden, T. Robinson, J. Guevara, W. Lawson, B. Hogan
{"title":"W-Band gyroklystron for high power RF applications","authors":"J. Neilson, L. Ives, M. Read, M. Mizuhara, D. Marsden, T. Robinson, J. Guevara, W. Lawson, B. Hogan","doi":"10.1109/IVEC.2003.1286376","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286376","url":null,"abstract":"W-band gyroklystron for high power RF applications was investigated in this paper. Calabazas creek research is developing a 91.4 GHz gyrokystron to produce 10 MW of RF power with efficiency greater than 35% and a gain of 57 dB. The design uses the second harmonic mode to reduce the magnetic field requirements. Gyroklystron employs six cavities consisting of an input cavity, three buncher cavities and a final output cavity. The input cavity is a fundamental mode cavity operating in the TE/sub 011/ mode. The buncher cavities operate in the TE/sub 021/ mode.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127804711","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
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