Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)最新文献_第2页

Ka-band extended interaction klystrons (EIKs) for satellite communication equipment 用于卫星通信设备的ka波段扩展交互速调管(eik)

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999400

M. Hyttinen, P. Horoyski, A. Roitman

引用次数: 9

Discrete-state simulated annealing for traveling-wave tube slow-wave circuit optimization 行波管慢波电路优化的离散态模拟退火

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999283

Jeffrey D. Wilson, B. A. Bulson, C. Kory

{"title":"Discrete-state simulated annealing for traveling-wave tube slow-wave circuit optimization","authors":"Jeffrey D. Wilson, B. A. Bulson, C. Kory","doi":"10.1109/IVELEC.2002.999283","DOIUrl":"https://doi.org/10.1109/IVELEC.2002.999283","url":null,"abstract":"Algorithms based on simulated annealing (SA) have proven useful in designing traveling-wave tube (TWT) slow-wave circuits for high RF power efficiency. The main disadvantage of SA is that there is not a rigorous theoretical foundation for determining the cooling schedule parameters. The choice of these parameters is highly problem dependent and the designer needs to experiment in order to determine values that will provide a good optimization in a reasonable amount of computational time. In order to eliminate this disadvantage, a variation of SA known as discrete-state simulated annealing (DSSA) (Cantelmi, 2000) was recently developed. DSSA provides the theoretical foundation for a generic cooling schedule which is problem independent. Results of similar quality to SA can be obtained with significantly fewer iterations and without the extra computational time required to tune the cooling parameters. An algorithm based on DSSA was developed and programmed into a Microsoft Excel spreadsheet GUI to the 2D nonlinear multisignal helix traveling-wave amplifier analysis program TWA3 (MacGregor, 1993). The algorithm optimizes the computed RF power efficiency of a TWT by determining the phase velocity profile of the slow-wave circuit.","PeriodicalId":344852,"journal":{"name":"Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)","volume":"258 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":"115804585","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

Simulation of the diamond-film field emission arrays with parallel emitter, gates and in-plan lens 具有平行发射极、栅极和平面透镜的金刚石膜场发射阵列的仿真

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999343

B. Zeng, Yang Liu, Zhonghai Yang, Shangjie Qian

引用次数: 0

Design and performance of vacuum electron devices for digital communications 数字通信用真空电子器件的设计与性能

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999229

D. Goebel, W. Menninger

引用次数: 6

A simulated annealing algorithm for the optimization of multistage depressed collector efficiency 多级抑制集热器效率优化的模拟退火算法

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999316

K. R. Vaden, J.D. Wilson, B. A. Bulson

引用次数: 11

The design of the transition region in coupled-cavity TWT 耦合腔行波管过渡区的设计

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999282

T. Kageyama

引用次数: 6

Coining manufacturing process for high power TWTs and TWTAs 大功率行波管及行波管的铸造工艺

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999352

R. Pyles, R. S. Kim

引用次数: 0

Development of Ku-band frequency-doubling coaxial gyroklystrons for accelerator applications 加速器用ku波段倍频同轴回旋速调管的研制

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999271

W. Lawson, B. Hogan, S. Gouveia, B. Huebschman, V. Granatstein

{"title":"Development of Ku-band frequency-doubling coaxial gyroklystrons for accelerator applications","authors":"W. Lawson, B. Hogan, S. Gouveia, B. Huebschman, V. Granatstein","doi":"10.1109/IVELEC.2002.999271","DOIUrl":"https://doi.org/10.1109/IVELEC.2002.999271","url":null,"abstract":"Summary form only given. At the University of Maryland, we have been exploring the possibility of using gyroklystrons to drive advanced linear colliders above X-band. We have designed and tested a high-gain four-cavity frequency-doubling system to enable us to use a phase-stable TWT driver. We have also designed an output waveguide system which transforms the power from the output waveguide and equally divides it into two standard WR62 rectangular waveguides. The scheme involves a rippled wall converter to convert the TE/sub 02/ mode to the TE/sub 01/ mode, then a custom converter to produce the TE/sub 20/ mode in the rectangular guide, followed by linear tapers and a standard bifurcation. We hope to use this transport system to energize and test Ku-band accelerator structures. In this paper, we present the experimental results of our four-cavity frequency doubling coaxial gyroklystron. The beam voltage and current are 460 kV and 540 A, respectively, and the applied magnetic field is about 5 kG. The expected interaction efficiency and gain at our design point are 34% and 61 dB, respectively. We also present design and test results for a number of other subsystems. We compare the theoretical calculations with the cold test results for each of the components used in the output waveguide system and present amplitude and phase balance measurements for the two output rectangular waveguides. Finally, we describe efforts to improve beam quality via modifications in emitter design and manufacturing.","PeriodicalId":344852,"journal":{"name":"Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)","volume":"42 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":"127807349","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: 16

Polyspectral techniques for nonlinear system modeling and distortion compensation 非线性系统建模与失真补偿的多光谱技术

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999397

C.P. Silva, A. Moulthrop, M. Muha

引用次数: 5

Studies of relativistic backward wave oscillator with low magnetic field 低磁场相对论性后向波振荡器的研究

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999257

S. Korovin, V. Rostov, E.M. Totmeninov

{"title":"Studies of relativistic backward wave oscillator with low magnetic field","authors":"S. Korovin, V. Rostov, E.M. Totmeninov","doi":"10.1109/IVELEC.2002.999257","DOIUrl":"https://doi.org/10.1109/IVELEC.2002.999257","url":null,"abstract":"Summary form only given. The one of applications of the relativistic Backward Wave Oscillator (BWO) is its use as a source of high power pulsed microwaves for nanosecond radiolocation To realise of 10 GHz high-power nanosecond radar, superconductive magnets were employed. Strong axial magnetic field (3 T) produced by the magnets provided the formation of a thin-wall tubular electron beam with low transverse velocities and its transportation through a slow-wave structure (SWS). The application of strong magnetic fields is inspired by the fact that the BWO efficiency tends to decrease, as the field value becomes lower. Two effects cause this. The first is due to cyclotron resonant interaction between the electrons and backward electromagnetic wave, so as a result the wave power is converted into transverse oscillations of electrons (resonant field is about 1.3 T for 500 keV electron energy and 10 GHz frequency). The second is determined by the deficiently high quality of the electron beam produced in the coaxial magnetically insulated vacuum diode with cold emission cathode. The level of 0.5-0.7 T was of primary concern because the permanent magnets in this case are real. The interest in improving the BWO efficiency in a low magnetic field were connected with idea of increasing the diameters of the SWS and cathode. This allows a reduction in the transverse electric fields both near the cathode and inside the SWS which makes the transverse interaction less important. However, for an oversized SWS the mode selection should be provided.","PeriodicalId":344852,"journal":{"name":"Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)","volume":"27 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":"115035089","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