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2007 IEEE International Vacuum Electronics Conference最新文献

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Design and Operation of an Eight-Beam Multiple-Beam Klystron with 6% Bandwidth 6%带宽八波束多波束速调管的设计与运行
2007 IEEE International Vacuum Electronics Conference Pub Date : 2007-05-15 DOI: 10.1109/IVELEC.2007.4283280
D. Abe, B. Levush, K. Nguyen, D. Pershing, F. Wood, R. Myers, E. Eisen
{"title":"Design and Operation of an Eight-Beam Multiple-Beam Klystron with 6% Bandwidth","authors":"D. Abe, B. Levush, K. Nguyen, D. Pershing, F. Wood, R. Myers, E. Eisen","doi":"10.1109/IVELEC.2007.4283280","DOIUrl":"https://doi.org/10.1109/IVELEC.2007.4283280","url":null,"abstract":"We describe the design and cold-test characterization (i.e., without beam) of a broadband eight-beam, fundamental-mode multiple-beam klystron (MBK), and present preliminary experimental hot-test results. The MBK is designed to have a 3-dB instantaneous bandwidth of -6% and uses an existing eight-beam electron gun that operates at a nominal cathode voltage of 45 kV and a total current of 32 A (K.T. Nguyen et al., 2004).","PeriodicalId":254940,"journal":{"name":"2007 IEEE International Vacuum Electronics Conference","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126174578","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
Experimental Study on Gyrotron Efficiency Enhancement 提高回旋管效率的实验研究
2007 IEEE International Vacuum Electronics Conference Pub Date : 2007-05-15 DOI: 10.1109/IVELEC.2007.4283209
E. Choi, A. Cerfon, M. Shapiro, J. Sirigiri, R. Temkin
{"title":"Experimental Study on Gyrotron Efficiency Enhancement","authors":"E. Choi, A. Cerfon, M. Shapiro, J. Sirigiri, R. Temkin","doi":"10.1109/IVELEC.2007.4283209","DOIUrl":"https://doi.org/10.1109/IVELEC.2007.4283209","url":null,"abstract":"Efficiency enhancement is one of the most important issues in modern high power, high frequency gyrotrons. High efficiency gyrotrons will require less prime power, which results in significant cost savings and increase in reliability of the power supply. To meet the International Thermonuclear Experimental Reactor (ITER) specifications, gyrotron efficiency has to be greater than 50 %. Furthermore, higher efficiency will reduce the collector loading and improve the life time of the tube. Depressed collector operation can enhance the gyrotron overall efficiency significantly. The experimental results from the 1.5 MW, 110 GHz gyrotron with a single-stage depressed collector are presented in this paper.","PeriodicalId":254940,"journal":{"name":"2007 IEEE International Vacuum Electronics Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129799618","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
Energy Transfer from Electron Beam to Electromagnetic Wave having Envelope with Phase Inversion 具有相位反转包络的电子束向电磁波的能量传递
2007 IEEE International Vacuum Electronics Conference Pub Date : 2007-05-15 DOI: 10.1109/IVELEC.2007.4283365
K. Lukin
{"title":"Energy Transfer from Electron Beam to Electromagnetic Wave having Envelope with Phase Inversion","authors":"K. Lukin","doi":"10.1109/IVELEC.2007.4283365","DOIUrl":"https://doi.org/10.1109/IVELEC.2007.4283365","url":null,"abstract":"Generation of electromagnetic (EM) waves in microwave vacuum electron devices takes place due to fundamental phenomena known as instabilities of electron beams (EB) with respect to EM fields. One of the most popular instability is related to Cherenkov type interaction that takes place when EB moves along a wave propagation direction with initial velocity slightly higher than the wave phase velocity. Such instability is exploited in TWT, Carsinotron and BWO tubes. The basic physical principles of energy exchange are well studied. Similar (but not completely the same) mechanism takes place in diffraction radiation generator (DRG) and orotron where kinetic energy of electrons is transferred to EM field of open resonator (OR) with periodic structure. In these devices energy exchange and self-oscillations may be formally described in terms of interaction of EB with synchronous spatial harmonic of EM field of OR, which is mathematically a travelling wave. However, because of rather different physical nature of the EM fields excited in OR (or any other resonators) one may face qualitatively different picture of EB energy transfer to EM field. In the paper such unusual phenomena are considered theoretically. The results obtained have been approved experimentally for DRG.","PeriodicalId":254940,"journal":{"name":"2007 IEEE International Vacuum Electronics Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129317929","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 Fitting Model for High Current Density Field Emission Arrays 高电流密度场发射阵列的拟合模型
2007 IEEE International Vacuum Electronics Conference Pub Date : 2007-05-15 DOI: 10.1109/IVELEC.2007.4283344
Ming-Chieh Lin
{"title":"A Fitting Model for High Current Density Field Emission Arrays","authors":"Ming-Chieh Lin","doi":"10.1109/IVELEC.2007.4283344","DOIUrl":"https://doi.org/10.1109/IVELEC.2007.4283344","url":null,"abstract":"We have developed a new method for fitting the current-voltage (I-V) characteristics of the field emission arrays (FEAs) that may be operated at high current density. The self-consistent model is demonstrated to be a good fit to the I-V characteristics of high current density FEAs. This also indicates that the space charge effects play an essential role in the saturation behaviour of FEAs.","PeriodicalId":254940,"journal":{"name":"2007 IEEE International Vacuum Electronics Conference","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127098604","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 multi-waveguide output structure for gyrotron applications 一种用于回旋管的多波导输出结构
2007 IEEE International Vacuum Electronics Conference Pub Date : 2007-05-15 DOI: 10.1109/IVELEC.2007.4283326
Yin Li, J. Luo, Mingkui Zhu, Ben-tian Liu
{"title":"A multi-waveguide output structure for gyrotron applications","authors":"Yin Li, J. Luo, Mingkui Zhu, Ben-tian Liu","doi":"10.1109/IVELEC.2007.4283326","DOIUrl":"https://doi.org/10.1109/IVELEC.2007.4283326","url":null,"abstract":"With the increase of operating frequency, the size of the rectangular waveguide for microwave propagation will reduce and it is usually 7.11 mm*3.56 mm in Ka-band, which limits its power propagation capability. Gyrotron is a new type of high power microwave source, which can generate the peak output power of more than 100 kW in Ka-band. So it is difficult for microwave power propagation with single above rectangular waveguide in this frequency band. In this paper, in order to improve the output capability of peak power for the gyrotron system with single mode propagation, a multi-waveguide output structure is simulated and analyzed.","PeriodicalId":254940,"journal":{"name":"2007 IEEE International Vacuum Electronics Conference","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127485880","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
Ka Band High Power Multi-Port Amplifier (MPA) Configured with TWTA for Winds Satellite 为wind卫星配置TWTA的Ka波段大功率多端口放大器
2007 IEEE International Vacuum Electronics Conference Pub Date : 2007-05-15 DOI: 10.1109/IVELEC.2007.4283384
I. Hosoda, T. Kuroda, Y. Ogawa, M. Shimada
{"title":"Ka Band High Power Multi-Port Amplifier (MPA) Configured with TWTA for Winds Satellite","authors":"I. Hosoda, T. Kuroda, Y. Ogawa, M. Shimada","doi":"10.1109/IVELEC.2007.4283384","DOIUrl":"https://doi.org/10.1109/IVELEC.2007.4283384","url":null,"abstract":"It is important to use satellite RF power efficiently in restricted satellite resource, especially in case of Ka-band communication systems. For the purpose of efficient use of RF power in satellite systems Ka-band high power multi-port amplifier (MPA) is adopted in WINDS (wideband internetworking engineering test and demonstration satellite) system, this will be launched by the H-IIA launch vehicle in 2008. This paper describes outline of the MPA for WINDS and its test results.","PeriodicalId":254940,"journal":{"name":"2007 IEEE International Vacuum Electronics Conference","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129981232","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: 20
Coalesced-mode Inductively Loaded Interdigital Structure for Broadband TWTs 宽带行波管的合并模电感加载数字间结构
2007 IEEE International Vacuum Electronics Conference Pub Date : 2007-05-15 DOI: 10.1109/IVELEC.2007.4283236
V. L. Christie, Lalit Kumar, Narayanaswamy Balakrishnan
{"title":"Coalesced-mode Inductively Loaded Interdigital Structure for Broadband TWTs","authors":"V. L. Christie, Lalit Kumar, Narayanaswamy Balakrishnan","doi":"10.1109/IVELEC.2007.4283236","DOIUrl":"https://doi.org/10.1109/IVELEC.2007.4283236","url":null,"abstract":"In this paper, rectangular inductively loaded interdigital-slow wave (ILID-SWS) structure is analysed using quasi-TEM approach and 3-D simulations is presented. The analysis is validated with experimentation and the structure is found to be promising in terms of bandwidth when compared with folded waveguide-SWS and millitron SWS.","PeriodicalId":254940,"journal":{"name":"2007 IEEE International Vacuum Electronics Conference","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132054296","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
Electron gun simulation using Opera-3D/2D 电子枪模拟使用Opera-3D/2D
2007 IEEE International Vacuum Electronics Conference Pub Date : 2007-05-15 DOI: 10.1109/IVELEC.2007.4283232
Hanyan Li, Jinjun Feng
{"title":"Electron gun simulation using Opera-3D/2D","authors":"Hanyan Li, Jinjun Feng","doi":"10.1109/IVELEC.2007.4283232","DOIUrl":"https://doi.org/10.1109/IVELEC.2007.4283232","url":null,"abstract":"In the paper, computer simulations are performed using Opera to evaluate and optimize electron guns. A normal sampling distance, a factor needed to be optimized, is discussed how to affect the results, as well as the simulation results are presented. After optimizing, the results show calculated parameters of electron guns are in good agreement with measured values except a variation of 12.5% in the corresponding waist position.","PeriodicalId":254940,"journal":{"name":"2007 IEEE International Vacuum Electronics Conference","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132265223","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
Micro-Gated-Field Emission Arrays with Single Carbon Nanotubes Grown on Mo Tips Mo尖端单碳纳米管微栅场发射阵列
2007 IEEE International Vacuum Electronics Conference Pub Date : 2007-05-15 DOI: 10.1109/IVELEC.2007.4283285
Wensheng Shao, M. Ding, Changqing Chen, Xinghui Li, Guodong Bai, Jinjun Feng
{"title":"Micro-Gated-Field Emission Arrays with Single Carbon Nanotubes Grown on Mo Tips","authors":"Wensheng Shao, M. Ding, Changqing Chen, Xinghui Li, Guodong Bai, Jinjun Feng","doi":"10.1109/IVELEC.2007.4283285","DOIUrl":"https://doi.org/10.1109/IVELEC.2007.4283285","url":null,"abstract":"Using our approach previously reported, we have fabricated relatively large area micro-gated-field emission arrays with carbon nanotube (CNT) grown on Mo tips. By redesigning the device and fabrication processes, the percentage of single CNTs increased to about 50-70% with a substantial improvement in leakage current between gate and cathode and gate interceptive current. The I-V measurement of a 11000 cell array at a gate-to cathode voltage of 92 V showed an anode current of 1.2 mA, corresponding a current density of 0.57 A/cm2, with a gate current only 3.3% of the anode current.","PeriodicalId":254940,"journal":{"name":"2007 IEEE International Vacuum Electronics Conference","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131010122","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
Analysis of Radiation Pattern of 300 GHz CW Gyrotron FU CW I 300 GHz连续波回旋管FU连续波辐射方向图分析
2007 IEEE International Vacuum Electronics Conference Pub Date : 2007-05-15 DOI: 10.1109/IVELEC.2007.4283357
T. Saito, T. Nakano, K. Sakai, I. Ogawa, S. Mitsudo, Y. Tatematsu
{"title":"Analysis of Radiation Pattern of 300 GHz CW Gyrotron FU CW I","authors":"T. Saito, T. Nakano, K. Sakai, I. Ogawa, S. Mitsudo, Y. Tatematsu","doi":"10.1109/IVELEC.2007.4283357","DOIUrl":"https://doi.org/10.1109/IVELEC.2007.4283357","url":null,"abstract":"300 GHz CW gyrotron FU CW I has been developed and installed in University of Fukui. Performance test has been carried out and the maximum power of 1.75 kW / CW has been attained. The radiation pattern of the output beam has been measured in detail with an infrared camera. It has been confirmed that the output beam propagates as a Gaussian beam with high purity. However, the output power is radiated into multiple directions within a range of the magnetic field strength at the cavity, which indicates simultaneous oscillation of competing cavity modes.","PeriodicalId":254940,"journal":{"name":"2007 IEEE International Vacuum Electronics Conference","volume":"513 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123405521","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
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