发布求助
文献互助 智能选刊 最新文献

Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)最新文献

筛选
英文 中文
Material optimization and application of process controls for "stringer-free" 70/30 copper-nickel and Monel 404 alloys [microwave tube materials] “无弦”70/30铜镍和蒙奈尔404合金[微波管材料]的材料优化及工艺控制应用
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316221
J. Wellington, C. Massing, M. Worthington
{"title":"Material optimization and application of process controls for \"stringer-free\" 70/30 copper-nickel and Monel 404 alloys [microwave tube materials]","authors":"J. Wellington, C. Massing, M. Worthington","doi":"10.1109/IVELEC.2004.1316221","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316221","url":null,"abstract":"Summary form only given. Copper nickel alloys (70Cu/30Ni and Monel 404) are integral materials in VED design, chosen during the original development of microwave tube technology to satisfy a complex combination of material property requirements. Historically, the availability of these materials in requisite quality has been cyclic and unreliable. In 2002, a project was launched to establish a long-term, reliable and affordable supply of high-quality copper-nickel alloys to support the continued manufacture of microwave power tubes. The technical approach utilizes a novel casting process to produce material of requisite quality at a lower cost than the incumbent vacuum casting process. An extensive economic analysis was also performed, quantifying the trade-offs between material cost, inspection costs, product yield and economic order quantities. This presentation summarizes the results of this project.","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124282048","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
Harmonic results of a 460 GHz gyrotron 460 GHz回旋管的谐波结果
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316180
M. Hornstein, V. Bajaj, R. Griffin, K. Kreischer, I. Mastovsky, M. Shapiro, J. Sirigiri, R. Temkin
{"title":"Harmonic results of a 460 GHz gyrotron","authors":"M. Hornstein, V. Bajaj, R. Griffin, K. Kreischer, I. Mastovsky, M. Shapiro, J. Sirigiri, R. Temkin","doi":"10.1109/IVELEC.2004.1316180","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316180","url":null,"abstract":"We report the first results of a 460 GHz second harmonic gyrotron. In microsecond pulse length operation at 13 kV and 110 mA, power levels in the order of 1 W have been observed at the TE/sub 2,6/ mode at 456.2 GHz and the TE/sub 0,6/ mode at 458.6 GHz. Modes at the fundamental, including the TE/sub 0,3/ at 238 GHz and the TE/sub 2,3/ at 233 GHz, have output powers up to 70 W. The TE/sub 5,2/ mode was observed to tune continuously in frequency from 246 GHz to 248 GHz. The gyrotron is being processed for CW operation. At present, more than 12 W have been obtained in CW operation in the TE/sub 2,3/ mode at 233 GHz.","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123631297","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
Demonstration of a 95 GHz, 100 kW, CW gyrotron oscillator 演示95 GHz, 100千瓦，连续波回旋加速器振荡器
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316199
K. Felch, M. Blank, P. Borchard, P. Cahalan, S. Cauffman, T. S. Chu, H. Jory
{"title":"Demonstration of a 95 GHz, 100 kW, CW gyrotron oscillator","authors":"K. Felch, M. Blank, P. Borchard, P. Cahalan, S. Cauffman, T. S. Chu, H. Jory","doi":"10.1109/IVELEC.2004.1316199","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316199","url":null,"abstract":"Summary form only given. A program to develop a 100 kW power level, continuous wave (cw), 95 GHz gyrotron oscillator for use in a U.S. military system is currently underway at CPI. To date, three W-band gyrotron oscillators have been constructed and demonstrated. The third of the three gyrotrons developed for the program, which showed significant performance improvements over the first two, demonstrated 115 kW total output power for 43 kV cathode-to-collector voltage, 50 kV total accelerating voltage, and 4.8 A beam current for an efficiency of 56%. Pulses up to 18 minutes in duration, significantly beyond the required 6 minute pulse required by the program, were demonstrated at the 115 kW operating point.","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"374 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131519492","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
Recent advances in the MICHELLE 2D/3D electron gun and collector modeling code MICHELLE二维/三维电子枪和集热器建模代码的最新进展
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316341
J. Petillo, K. Eppley, L. Chernyakova, D. Panagos, J. Burdette, E. Nelson, X. Zhai, N. Dionne, M. Cattelino, J. Deford, K. Nguyen, B. Held, B. Levush
{"title":"Recent advances in the MICHELLE 2D/3D electron gun and collector modeling code","authors":"J. Petillo, K. Eppley, L. Chernyakova, D. Panagos, J. Burdette, E. Nelson, X. Zhai, N. Dionne, M. Cattelino, J. Deford, K. Nguyen, B. Held, B. Levush","doi":"10.1109/IVELEC.2004.1316341","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316341","url":null,"abstract":"The MICHELLE code is a new Finite-Element (FE) two-dimensional (2D) and three-dimensional (3D) electrostatic particle-in-cell (PIC) code that has been designed to address the recent beam optics modeling and simulation requirements for vacuum electron devices, ion sources, and charged-particle transport. Problem classes specifically targeted include depressed collectors, gridded-guns, multi-beam guns and sheet-beam guns. The focus of the development program is to combine modern finite-element techniques with improved physics models. The code employs a conformal mesh, including both structured and unstructured mesh architectures for meshing flexibility, along with a new method for accurate, efficient particle tracking. New particle emission models for thermionic beam representation are included that support primary emission, and secondary emission is handled with an advanced model. This presentation focuses on two significant advances to MICHELLE over the past year; hybrid structured/unstructured mesh support, and a time-domain electrostatic algorithm.","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131343587","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: 6
Effect of inhomogeneity on backward wave in a helix TWT 非均匀性对螺旋行波管后向波的影响
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316225
S. Ghosh, V. Kiran, F.S. Thangaraj
{"title":"Effect of inhomogeneity on backward wave in a helix TWT","authors":"S. Ghosh, V. Kiran, F.S. Thangaraj","doi":"10.1109/IVELEC.2004.1316225","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316225","url":null,"abstract":"In the inhomogeneously loaded helical slow-wave structure (SWS), the helix is supported by rectangular/circular and/or arbitrary shaped dielectric support geometry and the whole is enclosed in a metal envelope. In this paper, the authors present theoretical results obtained from GANGA (Ghosh's analysis with non-uniform GamaA for helix TWTs), to predict and control the potential backward-mode oscillation in a TWT for a wide range of structure parameters. It has been found that with the increase in structure inhomogeneity, the backward phase velocity and backward impedance increases with frequency but forward (fundamental) phase velocity and impedance (fundamental) decreases. Also the other structure parameters, namely, position of the metal envelope, helix pitch angle, helix tape thickness, etc, control the backward wave propagation. However, the effect of structure inhomogeneity is more pronounced.","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"203 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116509398","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
High efficiency linear C-band helix traveling wave tube 高效率线性c波段螺旋行波管
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316322
M. Chesnut
{"title":"High efficiency linear C-band helix traveling wave tube","authors":"M. Chesnut","doi":"10.1109/IVELEC.2004.1316322","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316322","url":null,"abstract":"Summary form only given. This paper describes the development and performance of a C-band helix traveling wave tube. A new high efficiency collector was developed that employs elaborate electrode processing to reduce the secondary electron emission ratio, advanced asymmetrical electrode geometry, transverse magnetic flux threading and a short refocusing section. Fewer secondary electrons are generated and more electrons stay in the collector, reducing helix or body current. Limiting input drive so the power output stays within the linear operating range of the TWT and avoids the near saturation region reduces both the spread and the mean of the velocity distribution in the electron beam. Capturing this beam with the new high efficiency collector mentioned above has enabled higher levels of collector depression than have been previously obtainable. The result is a TWT that is more efficient, is easier to cool and has lower annual operating energy costs.","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133930442","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
Design of space-charge-limited magnetron injection guns 空间限荷磁控管注射枪的设计
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316346
W. Lawson, H. Raghunathan
{"title":"Design of space-charge-limited magnetron injection guns","authors":"W. Lawson, H. Raghunathan","doi":"10.1109/IVELEC.2004.1316346","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316346","url":null,"abstract":"We present the results of several space-charge-limited (SCL) magnetron injection gun (MIG) designs which are intended for use with a 500 kV, 500 A gyroklystron. The design performances are compared to that of a temperature-limited (TL) gun that was constructed for the same application. The SCL designs yield similar values for beam quality, namely an axial velocity spread under 3% for an average perpendicular-to-parallel velocity ratio of 1.5. The peak electric fields and the cathode loadings of the SCL designs are somewhat higher than for the TL design.","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134441823","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
Magnetron microwave noise reduction and magnetic priming by azimuthally varying axial magnetic fields 磁控管微波降噪与轴向磁场方向变化的磁激发
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316250
V. Neculaes, R. Gilgenbach, Y. Lau, M.C. Jones, J. Luginsland, W. White, P. Pengvanich, N. Jordan, Y. Hidaka, H. Bosman
{"title":"Magnetron microwave noise reduction and magnetic priming by azimuthally varying axial magnetic fields","authors":"V. Neculaes, R. Gilgenbach, Y. Lau, M.C. Jones, J. Luginsland, W. White, P. Pengvanich, N. Jordan, Y. Hidaka, H. Bosman","doi":"10.1109/IVELEC.2004.1316250","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316250","url":null,"abstract":"We report recent experiments demonstrating that application of an azimuthally varying axial magnetic field to microwave magnetrons causes a dramatic decrease in the microwave noise and virtual elimination of sidebands. This magnetic perturbation technique also causes rapid-startup of magnetrons; we call this novel technique \"magnetic priming.\".","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131032781","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
Chemistry and surface physics phenomena involved in the activation of impregnated tungsten dispenser cathodes 浸渍钨分配器阴极活化所涉及的化学和表面物理现象
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316325
L. Falce, L. Garbini
{"title":"Chemistry and surface physics phenomena involved in the activation of impregnated tungsten dispenser cathodes","authors":"L. Falce, L. Garbini","doi":"10.1109/IVELEC.2004.1316325","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316325","url":null,"abstract":"Summary form only given. In most fast wave and slow wave vacuum electron devices dispenser cathodes, which are made of porous tungsten impregnated with barium calcium aluminate, are used as the electron source. A very necessary process called activation must occur that results in barium uniformly covering the surface and remaining there for a sufficient time to provide a lowered work function. The key to this is the formation of a dipole of barium over oxygen over the metal substrate from which the electrons are pulled. A fully activated surface must have every available site occupied by the barium-oxygen dipole. This not only provides the lowest work function but also assures a constant and uniform source of electrons during the life of the device. The chemical reactions that take place and the processes required to remove the unwanted species from the surface are described.","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132314622","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
Waveguide power combiner demonstration for multiple high power millimeter wave TWTAs 多个高功率毫米波twta的波导功率合成器演示
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) Pub Date : 2004-04-27 DOI: 10.1109/IVELEC.2004.1316216
E. Wintucky, R. Simons, G. Lesny, J. L. Glass
{"title":"Waveguide power combiner demonstration for multiple high power millimeter wave TWTAs","authors":"E. Wintucky, R. Simons, G. Lesny, J. L. Glass","doi":"10.1109/IVELEC.2004.1316216","DOIUrl":"https://doi.org/10.1109/IVELEC.2004.1316216","url":null,"abstract":"Summary form only given. The work presented here is the results of a proof-of-concept demonstration of the power combining Ka-band waveguide circuit design and test procedure using two Ka-band TWTAs (Varian model VZA6902V3 and Logimetrics model A440/KA-1066), both of which were previously employed in data uplink evaluation terminals at 29.36 GHz for the NASA Advanced Communications Technology Satellite (ACTS) program. The characterization of the individual TWTAs and power combining demonstration were carried out over a 500 MHz bandwidth from 29.1 to 29.6 GHz to simulate the deep space network (DSN) bandwidth of 31.8 to 32.3 GHz. The input and output powers were corrected for circuit insertion losses due to the waveguide components. The RF saturated powers of both ACTS TWTAs were in the order of 120 W.","PeriodicalId":283559,"journal":{"name":"Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132490611","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: 10
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信