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

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Vacuum electronics and related technologies on-board present and future ESA missions 真空电子和相关技术在目前和未来的欧空局任务
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286384
P. Waller
{"title":"Vacuum electronics and related technologies on-board present and future ESA missions","authors":"P. Waller","doi":"10.1109/IVEC.2003.1286384","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286384","url":null,"abstract":"This paper reviews the use and main characteristics of microwave vacuum tubes and related technologies on-board current ESA missions. Major mission and system requirements are presented, as well as key technical and technological achievements are also presented. Finally, an overview of possible future directions for vacuum electronics in space are discussed.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"42 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":"127816507","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
Development and deployment of 50 kW high efficiency IOTs for industrial and scientific services 为工业和科学服务开发和部署50kw高效物联网
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286005
Yanxia Li, H. Bohlen, B. Tornoe
{"title":"Development and deployment of 50 kW high efficiency IOTs for industrial and scientific services","authors":"Yanxia Li, H. Bohlen, B. Tornoe","doi":"10.1109/IVEC.2003.1286005","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286005","url":null,"abstract":"The Eimac division has developed and produced IOT amplifiers for more than 15 years. Although the major services area has been UHF television broadcasting, Eimac IOT systems are designed and built to be capable of operating at conditions other than TV to deliver up to 130 kW peak RF power at the desired efficiency and gain levels. Since most of the industrial and scientific applications require hundreds to over thousands of kilowatts of RF power, the electrical power requirement and the operating cost are tremendous. Therefore, based on the TV IOT K2D150 a new product, K2H50, is developed and put in production. The objectives of this program are as follows: 1) stable operation at 50 kW CW or higher for frequencies ranging from 470 to 800 MHz. 2) 70% electrical efficiency with more than 20 dB gain. 3) preservation of the broadcast IOTs quick-tube-change features. The IOT amplifier has been tested in the factory at different conditions. The variation from tube to tube is minimal and the results are repeatable without difficulty.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"121 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133721002","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
Large-signal analysis for BWO start condition in helix TWTs 螺旋行波管BWO起动条件的大信号分析
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286331
S. K. Datta, L. Kumar, S. Kumar, B. Basu
{"title":"Large-signal analysis for BWO start condition in helix TWTs","authors":"S. K. Datta, L. Kumar, S. Kumar, B. Basu","doi":"10.1109/IVEC.2003.1286331","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286331","url":null,"abstract":"Large-signal analysis for backward-wave oscillation (BWO) start condition in a helix travelling-wave tube (TWT) amplifier has been developed. The effects of distributed circuit loss and beam-filling factor on start oscillation condition are investigated, and large-signal analysis results are presented vis-a-vis Eulerian analysis results.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"208 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":"123617204","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: 4
The diagnostics of high-power microwave from virtual cathode oscillator with the coupled line band pass filter 耦合线带通滤波器对虚阴极振荡器大功率微波的诊断
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286233
K. B. Song, K. Y. Sung, W. Jeon, Y. Jung, M. C. Choi, E. Choi
{"title":"The diagnostics of high-power microwave from virtual cathode oscillator with the coupled line band pass filter","authors":"K. B. Song, K. Y. Sung, W. Jeon, Y. Jung, M. C. Choi, E. Choi","doi":"10.1109/IVEC.2003.1286233","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286233","url":null,"abstract":"The research of high-power microwave generation has been studied a lot by several methods. virtual cathode oscillator (vircator) can be one of the most promising high-power microwave sources due to its conceptual simplicity and high-output power capability. It is also noted that the frequency bandwidth of vircator is known to be wide. In this experiment, a high-power microwave generator has been obtained from the intense relativistic electron beam pulser, \"Chundoong\" (Maximum voltage: 600 kV, maximum current 85 kA, and pulse duration of 60 ns). It is of great importance to investigate the measurement of high power microwave frequency, along with the improvement of its output power. For the purpose of accurate measurement of high power microwave frequency, the coupled line band pass filters have been designed and fabricated in this experiment. The frequency spectrum of high power microwave generated from the virtual cathode oscillator based on the \"Chundoong\" system has been investigated by the coupled line band pass filter. With the use of several coupled line band pass filters swept from 4 to 8 GHz with band resolution of 1 GHz, the microwave frequency and its power have been investigated under A-K gap distance of 4, 6 and 8 mm. It is found that the microwave frequency has been measured to be 5.2 GHz by the dispersive delay line method under the A-K gap distance 6 mm, which is well agreed with that obtained from the coupled line band pass filter.","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":"126001739","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
Evolution in the thermal performance of radiation-cooled traveling wave tubes for satellite applications 卫星用辐射冷却行波管热性能的演变
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286329
M. Kaliski
{"title":"Evolution in the thermal performance of radiation-cooled traveling wave tubes for satellite applications","authors":"M. Kaliski","doi":"10.1109/IVEC.2003.1286329","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286329","url":null,"abstract":"In the radiation-cooled TWT design, a radiating structure is installed over the collector electrodes and located outside of the spacecraft, allowing the majority of the collector thermal dissipation to radiate directly to space. This paper explores the evolution in TWT radiator temperatures over life, in an attempt to determine the relative degradation, if any, in TWT radiator optical properties as such degradation can lead to increased radiator temperatures. An example of the temperature increase over is life is presented.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"89 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":"124597725","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
Operation of high power 84-GHz gyrotron for KSTAR ECH system KSTAR ECH系统大功率84-GHz回旋管的运行
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286025
Y. Bae, H.K. Lee, J. Jeong, W. Namkung, M. Cho, S. Chu
{"title":"Operation of high power 84-GHz gyrotron for KSTAR ECH system","authors":"Y. Bae, H.K. Lee, J. Jeong, W. Namkung, M. Cho, S. Chu","doi":"10.1109/IVEC.2003.1286025","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286025","url":null,"abstract":"The initial objective of the KSTAR ECH system is to produce seed plasmas by irradiation of powerful millimeter waves for the main ohmic discharges. A specially designed gyrotron, manufactured by CPI, has specifications of 500 kW, 84 GHz, and 2- second pulse duration. It adopts the state-of-arts technologies of a diode gun, a depressed potential collector, an internal mode converter, and a diamond window. As a part of the final acceptance tests of the gyrotron, we constructed a test and including a test modulator to confirm its operating conditions. With short-pulses of 20 microseconds, we produced the output peak power of 500 kW at 84 GHz. The output power distribution is confirmed to be a Gaussian by IR images on targets. In this experimental study, we describe details of the gyrotron, the test stand, and experimental results.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"38 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":"124727173","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: 13
Development of frequency step tunable 1 MW gyrotrons in D-band d波段频率阶跃可调谐1mw回旋管的研制
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286019
M. Thumm, A. Arnold, E. Borie, G. Dammertz, O. Drumm, R. Heidinger, M. Kartikeyan, K. Koppenburg, A. Meier, B. Piosczyk, D. Wagner, X. Yang
{"title":"Development of frequency step tunable 1 MW gyrotrons in D-band","authors":"M. Thumm, A. Arnold, E. Borie, G. Dammertz, O. Drumm, R. Heidinger, M. Kartikeyan, K. Koppenburg, A. Meier, B. Piosczyk, D. Wagner, X. Yang","doi":"10.1109/IVEC.2003.1286019","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286019","url":null,"abstract":"Gyrotrons are widely used in electron-cyclotron-plasma heating of fusion installations. Modern and future installations require microwave sources with power of at least 1 MW. There are two main directions in the development of megawatt gyrotrons at GYCOM. The first line is an enhancement of parameters for conventional gyrotrons. The main efforts are applied now to implementing of CVD diamond windows into the gyrotrons and providing gyrotron operation in CW (or very long pulses of tens seconds) regime.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"61 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":"127103709","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: 18
TWT with combined symmetric E/sub 01/+T- wave of coaxial corrugated waveguide 同轴波纹波导组合对称E/sub - 01/+T波行波管
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286253
A. A. Kurayev, A.A. Navrotski, A. K. Sinitsyn
{"title":"TWT with combined symmetric E/sub 01/+T- wave of coaxial corrugated waveguide","authors":"A. A. Kurayev, A.A. Navrotski, A. K. Sinitsyn","doi":"10.1109/IVEC.2003.1286253","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286253","url":null,"abstract":"On the basis of the general theory of excitation of an irregular coaxial goffered waveguide the mathematical model is created and the program for optimization of parameters of TWT-O with azimuthal symmetric combined ?/sub 01/+? - wave is developed. Executed calculations indicate to perspectivity of such TWT. It is shown, that for regular corrugation efficiency of 50% is reached at /spl szlig//sub 0/=0.8 (V/sub 0/=345 ?V), I/sub 0/=310 A.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"39 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":"127385915","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 training method for planar cathode based on carbon fiber powder 基于碳纤维粉末的平面阴极训练方法
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286277
A. Baturin, R.G. Tchesov, K.N. Nikolski, E. Sheshin
{"title":"The training method for planar cathode based on carbon fiber powder","authors":"A. Baturin, R.G. Tchesov, K.N. Nikolski, E. Sheshin","doi":"10.1109/IVEC.2003.1286277","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286277","url":null,"abstract":"The training method for planar cathode based on carbon fiber powder significantly improves the field emission performances. The main point of the training is the forming the optimized emission surface under the residual gases ion bombardment during cathode operating in technical vacuum. There are two main methods of the cathode training. The first one consists in applying of constant voltage between cathode and extracting electrode and other method one should vary the applied voltage to hold the emission current on the constant level according to the cathode structure.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"31 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":"127217053","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 step towards a 170 GHz, 5 MW coaxial super gyrotron 迈向170千兆赫，5毫瓦同轴超级回旋管的一步
4th IEEE International Conference on Vacuum Electronics, 2003 Pub Date : 2003-05-28 DOI: 10.1109/IVEC.2003.1286023
M. Kartikeyan
{"title":"A step towards a 170 GHz, 5 MW coaxial super gyrotron","authors":"M. Kartikeyan","doi":"10.1109/IVEC.2003.1286023","DOIUrl":"https://doi.org/10.1109/IVEC.2003.1286023","url":null,"abstract":"In this paper , the feasibility of a super power coaxial gyrotron at 5 MW, 170 GHz, operating in the TE/sub 44,44/ mode is presented as a small step towards a big leap from 2MW to 5 MW power levels. Gyrotrons are high power microwave sources widely employed for electron cyclotron resonance heating (ECRH) of plasmas, and in other industrial and scientific applications. Such a realization will drastically reduce the number of gyrotrons operating in tandem in Tokamak installations.","PeriodicalId":203178,"journal":{"name":"4th IEEE International Conference on Vacuum Electronics, 2003","volume":"140 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":"127487687","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: 3
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