Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)最新文献_第8页

Realization of high efficiency in a plasma-assisted microwave source with two-dimensional electron motion 二维电子运动等离子体辅助微波源高效率的实现

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999256

A. Shkvarunets, Y. Carmel, G. Nusinovich, T. Abu-elfadl, J. Rodgers, T. Antonsen, V. Granatstein, D. Goebel

引用次数: 11

Improved modeling of backscattered electron effects in a code for depressed collector design 改进后的后向散射电子效应的模型在一个代码中用于消沉集热器设计

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999365

A. Valfells, A. Singh, M. Kolander, V. Granatstein

{"title":"Improved modeling of backscattered electron effects in a code for depressed collector design","authors":"A. Valfells, A. Singh, M. Kolander, V. Granatstein","doi":"10.1109/IVELEC.2002.999365","DOIUrl":"https://doi.org/10.1109/IVELEC.2002.999365","url":null,"abstract":"A suite of codes for the computer aided design of depressed collectors has been under development at the Institute for Research in Electronics and Applied Physics in the past few years. A critical feature of these codes is the modeling of secondary electron emission, both the correct emission coefficients, and the correct distributions of emission angle and energy. The BSCAT code which handles the generation of secondary and backscattered electrons uses a method of ray coalescing to give a representative sample of the backscattered electrons while limiting the number of trajectories that must be traced. Recent work has focused on improving the physical model used for the MonteCarlo process of generating secondary electrons. This has involved both incorporating known, accurate models for emission characteristics, and the development of models to describe certain aspects of backscattering. Here we are showing additional examples of usage of the general approach. We have also added capabilities to the code for showing the trajectories of the electrons and for calculating the heat deposited on the collector surface.","PeriodicalId":344852,"journal":{"name":"Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)","volume":"4 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":"125466402","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

The influence of the magnetic field on the problem of stability in a crossed-field diode 磁场对交叉场二极管稳定性问题的影响

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999311

P. A. Lindsay, W. Toh, Xiao Dong Chen

{"title":"The influence of the magnetic field on the problem of stability in a crossed-field diode","authors":"P. A. Lindsay, W. Toh, Xiao Dong Chen","doi":"10.1109/IVELEC.2002.999311","DOIUrl":"https://doi.org/10.1109/IVELEC.2002.999311","url":null,"abstract":"Although in general an axial magnetic field is frequently used to stabilize an electron beam, its influence is highly deleterious in the case of a coaxial vircator. In our investigations of the above effect we have modelled the electron-beam generating element of the vircator using a plane crossed-field diode (magnetic gap). In the process of analyzing the effect of the strength of the magnetic field on the development of a 'virtual cathode' we have assumed, following the case of zero magnetic field, that for certain ranges of the parameters the electron now is stable, whereas for other ranges it is unstable. Our assumption was largely based on some topological similarities of the two systems. In our present work we are investigating the problem more rigorously using analytical procedures. Following some earlier work which was however limited to the case of zero magnetic field, we investigated the roots of a complex variable function in order to determine the stability properties of the system. We were then able to show that the assumptions concerning the stability of solutions are in fact justified. Furthermore we were also able to show how the ranges of instability depend on the strength of the magnetic field.","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":"131801603","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

Pulsed phase measurement techniques for vacuum electronic amplifiers 真空电子放大器的脉冲相位测量技术

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999411

K.B. Mitsdarffer, L. Hoover, D. Thelen

引用次数: 0

Chaotic oscillations in a relativistic backward-wave oscillator 相对论性后向波振荡器中的混沌振荡

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999307

N. Ryskin, V. Titov

引用次数: 1

Applications of microwave vacuum tube amplifiers in earth and space science 微波真空管放大器在地球与空间科学中的应用

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999228

W. Harvey, F.F. Chiha, M. S. Dennis

引用次数: 0

Effect of the radial thickness of electron beams on mode coupling and stability in gyrotrons 电子束径向厚度对回旋管模式耦合和稳定性的影响

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999409

G. Nusinovich, O. Sinitsyn, M. Yedulla, L. Velikovich

{"title":"Effect of the radial thickness of electron beams on mode coupling and stability in gyrotrons","authors":"G. Nusinovich, O. Sinitsyn, M. Yedulla, L. Velikovich","doi":"10.1109/IVELEC.2002.999409","DOIUrl":"https://doi.org/10.1109/IVELEC.2002.999409","url":null,"abstract":"In the development of gyrotrons for controlled fusion experiments (electron cyclotron resonance plasma heating and current drive, suppression of plasma instabilities), one of the most important problems is to provide a stable, highly efficient operation in the desired mode. So far this problem was considered under the assumption that the RF field in a gyrotron cavity is excited by an annular, ideally thin, cylindrical electron beam. However, as the wavelength shortens and the beam power increases, the spread in radii of electron guiding centers, R/sub b/, becomes more important for gyrotron operation. First, this spread reduces the efficiency because electrons with different guiding center radii have different coupling impedance to the RF field with a certain radial structure. Second, in the case of simultaneous interaction with several modes with different radial structures, the spread in guiding center radii may result in simultaneous excitation of these modes (a so-called \"weak\" coupling of modes, which extract energy from different fractions of the beam). The effect of the beam radial thickness on the mode interaction and stability is analyzed.","PeriodicalId":344852,"journal":{"name":"Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)","volume":"43 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":"131094938","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

Synthesis of folded waveguide TWT 折叠波导行波管的合成

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999278

Seong‐Tae Han, Jung-Il Kim, G. Park

引用次数: 8

Design and test of a 100 MW X-band TE/sub 01/ window 100mw x波段TE/sub 01/窗口的设计与测试

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999346

J. Neilson, L. Ives, Sami G. Tantawi

引用次数: 2

A low cost electrostatically focused TWT 低成本的静电聚焦行波管

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999326

B. Vancil, E. Wintucky

引用次数: 2