Pub Date : 2008-04-22DOI: 10.1109/IVELEC.2008.4556425
A. Laurent, M. Lefevre, T. Barsotti, D. Chesnel, P. Thouvenin
This paper deals firstly with the C band TWT delivering 25 kWp, 1100 W average between 5.4 and 5.9 GHz . Two prototypes were delivered and integrated. The second topic of this paper is the X band TWT delivering 9 kWp, 600W average between 9.45 and 9.95 GHz. This tube has been qualified in 2007 .
{"title":"High power C and X band Radar Helix TWTs","authors":"A. Laurent, M. Lefevre, T. Barsotti, D. Chesnel, P. Thouvenin","doi":"10.1109/IVELEC.2008.4556425","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556425","url":null,"abstract":"This paper deals firstly with the C band TWT delivering 25 kWp, 1100 W average between 5.4 and 5.9 GHz . Two prototypes were delivered and integrated. The second topic of this paper is the X band TWT delivering 9 kWp, 600W average between 9.45 and 9.95 GHz. This tube has been qualified in 2007 .","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121713011","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}
Pub Date : 2008-04-22DOI: 10.1109/IVELEC.2008.4556449
D. Komarov, A. V. Phetisova, S. Morev, Y.A. Miroshnikov, A. Gudovich, Y. Strukov
The developmentpsilas results of the TWT with the low-voltage griddles and the high electronic efficiency, the gain coefficient and a broad band amplified frequency are submitted.
介绍了具有低电压光栅、高电子效率、增益系数和宽带放大频率的行波管的研制成果。
{"title":"The X-range powerful TWT","authors":"D. Komarov, A. V. Phetisova, S. Morev, Y.A. Miroshnikov, A. Gudovich, Y. Strukov","doi":"10.1109/IVELEC.2008.4556449","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556449","url":null,"abstract":"The developmentpsilas results of the TWT with the low-voltage griddles and the high electronic efficiency, the gain coefficient and a broad band amplified frequency are submitted.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123319078","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}
Pub Date : 2008-04-22DOI: 10.1109/IVELEC.2008.4556338
S. Lenci, E. Eisen, M. Mccarthy, K. Rust
Communications and Power Industries, Inc (CPI) produced 81 klystrons for the Spallation Neutron Source at Oak Ridge National Laboratory. The klystrons are rated for 550 kW peak at 805 MHz. seventy units have accumulated 1,284,647 hours of filament operation and 820,429 hours of high voltage operation to date. A higher power 700 kW version has been developed and is now in production.
{"title":"Status of the 805-MHz pulsed klystrons for the Spallation Neutron Source","authors":"S. Lenci, E. Eisen, M. Mccarthy, K. Rust","doi":"10.1109/IVELEC.2008.4556338","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556338","url":null,"abstract":"Communications and Power Industries, Inc (CPI) produced 81 klystrons for the Spallation Neutron Source at Oak Ridge National Laboratory. The klystrons are rated for 550 kW peak at 805 MHz. seventy units have accumulated 1,284,647 hours of filament operation and 820,429 hours of high voltage operation to date. A higher power 700 kW version has been developed and is now in production.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123503353","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}
Pub Date : 2008-04-22DOI: 10.1109/IVELEC.2008.4556343
D. Dialetis, D. Chernin, T. Antonsen, B. Levush
We report on the results of a comparison study of the CHRISTINE 1D helix TWT simulation code with the small signal theory of a beam interacting with a slow wave supported by a sheath helix in the presence of loss, in order to ascertain whether attenuation is treated with sufficient accuracy by the ad hoc model used in the CHRISTINE code. This study was motivated in part by the fact that losses in both dielectrics and in metals generally increase with increasing operating frequency, making the accuracy of the CHRISTINE code a potential concern for mm-wave helix TWT design. The basic conclusion of this study is that the existing model of attenuation in CHRISTINE is sufficiently accurate for attenuation rates up to a few dB/pitch. For larger attenuation rates, accuracy can be further improved by taking into account the (quadratic) dependence of phase velocity on the attenuation rate.
{"title":"Accurate representation of attenuation in large - signal helix TWT simulation codes","authors":"D. Dialetis, D. Chernin, T. Antonsen, B. Levush","doi":"10.1109/IVELEC.2008.4556343","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556343","url":null,"abstract":"We report on the results of a comparison study of the CHRISTINE 1D helix TWT simulation code with the small signal theory of a beam interacting with a slow wave supported by a sheath helix in the presence of loss, in order to ascertain whether attenuation is treated with sufficient accuracy by the ad hoc model used in the CHRISTINE code. This study was motivated in part by the fact that losses in both dielectrics and in metals generally increase with increasing operating frequency, making the accuracy of the CHRISTINE code a potential concern for mm-wave helix TWT design. The basic conclusion of this study is that the existing model of attenuation in CHRISTINE is sufficiently accurate for attenuation rates up to a few dB/pitch. For larger attenuation rates, accuracy can be further improved by taking into account the (quadratic) dependence of phase velocity on the attenuation rate.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125170319","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}
Pub Date : 2008-04-22DOI: 10.1109/IVELEC.2008.4556526
Hanyan Li, Jinjun Feng
This paper simulate field emitter arrays (FEAs) in the triode mode using Opera-3D. From the calculation data, the factors affecting the emission uniformity including tip height and tip-to-tip distance have been studied.
{"title":"Simulation study of field emitter arrays using Opera-3D","authors":"Hanyan Li, Jinjun Feng","doi":"10.1109/IVELEC.2008.4556526","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556526","url":null,"abstract":"This paper simulate field emitter arrays (FEAs) in the triode mode using Opera-3D. From the calculation data, the factors affecting the emission uniformity including tip height and tip-to-tip distance have been studied.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124152050","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}
Pub Date : 2008-04-22DOI: 10.1109/IVELEC.2008.4556481
Yu-Lu Hu, Zhonghai Yang, Jianqing Li, Bin Li, Tao Huang, Q. Hu, Xiaolin Jin, Xiaofang Zhu, Shanshan Ma
In this paper, an optimization algorithm has been developed to provide robust designs for nonlinear beam-wave interaction of high-frequency traveling-wave tubes (TWTs). The algorithm utilizes the optimization method of hybrid genetic algorithm (Goldberg, 1990) in the TWT simulation code which is much like CHRISTINE-1D (Antonsen, 1998). By considering the effects of dimensional helix pitch variations during the optimization, the desired performance characteristics has been achieved.
{"title":"Hybrid genetic algorithm for optimization design of traveling wave tubes","authors":"Yu-Lu Hu, Zhonghai Yang, Jianqing Li, Bin Li, Tao Huang, Q. Hu, Xiaolin Jin, Xiaofang Zhu, Shanshan Ma","doi":"10.1109/IVELEC.2008.4556481","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556481","url":null,"abstract":"In this paper, an optimization algorithm has been developed to provide robust designs for nonlinear beam-wave interaction of high-frequency traveling-wave tubes (TWTs). The algorithm utilizes the optimization method of hybrid genetic algorithm (Goldberg, 1990) in the TWT simulation code which is much like CHRISTINE-1D (Antonsen, 1998). By considering the effects of dimensional helix pitch variations during the optimization, the desired performance characteristics has been achieved.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129303186","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}
Pub Date : 2008-04-22DOI: 10.1109/IVELEC.2008.4556498
O. Nikitenko, M. Volovenko
The crossed-field electron vacuum devices have a high noise level. Nonlinear interaction of electron beam and electromagnetic waves result in excitation of chaotic or combination oscillations. Here we observed Fourier spectrum of low and high frequency modes to prove excitation of chaotic behavior of oscillations in crossed-field electron vacuum devices.
{"title":"Chaotic behavior of oscillations in crossed-field electron vacuum devices","authors":"O. Nikitenko, M. Volovenko","doi":"10.1109/IVELEC.2008.4556498","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556498","url":null,"abstract":"The crossed-field electron vacuum devices have a high noise level. Nonlinear interaction of electron beam and electromagnetic waves result in excitation of chaotic or combination oscillations. Here we observed Fourier spectrum of low and high frequency modes to prove excitation of chaotic behavior of oscillations in crossed-field electron vacuum devices.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129947868","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}
Pub Date : 2008-04-22DOI: 10.1109/IVELEC.2008.4556365
J. Dayton, G. Mearini, C. Kory, D. Malta, M. Lueck, J. Tabeling, S. Worthington, C. Holland, C. Spindt
Approximately twenty intricate diamond structures have been fabricated, selectively metallized and assembled into prototype 650 GHz backward wave oscillators (BWOs). The chemical vapor deposition (CVD) diamond structure is grown into a silicon mold fabricated using deep reactive ion etching. The lithographic fabrication processes employed produce dozens of devices from each lot. The RF power generated is radiated directly from the BWO for compatibility with a quasi-optical sub-mm system. The interdigital slow wave circuit, the electron gun, the output coupler and the antenna are fabricated as a single piece of diamond to eliminate difficulties with alignment. We will describe the processes of fabrication and assembly, and present available preliminary results of prototype testing.
{"title":"Assembly and preliminary testing of the prototype 650 GHz BWO","authors":"J. Dayton, G. Mearini, C. Kory, D. Malta, M. Lueck, J. Tabeling, S. Worthington, C. Holland, C. Spindt","doi":"10.1109/IVELEC.2008.4556365","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556365","url":null,"abstract":"Approximately twenty intricate diamond structures have been fabricated, selectively metallized and assembled into prototype 650 GHz backward wave oscillators (BWOs). The chemical vapor deposition (CVD) diamond structure is grown into a silicon mold fabricated using deep reactive ion etching. The lithographic fabrication processes employed produce dozens of devices from each lot. The RF power generated is radiated directly from the BWO for compatibility with a quasi-optical sub-mm system. The interdigital slow wave circuit, the electron gun, the output coupler and the antenna are fabricated as a single piece of diamond to eliminate difficulties with alignment. We will describe the processes of fabrication and assembly, and present available preliminary results of prototype testing.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128785158","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}
Pub Date : 2008-04-22DOI: 10.1109/IVELEC.2008.4556556
D. Whittum, M. Trail, G. E. Meddaugh
The state of the art in medical and industrial microwave accelerators is reviewed, with attention to the microwave system, structure design, performance and reliability.
综述了医用和工业用微波加速器的发展现状，重点介绍了微波系统、结构设计、性能和可靠性。
{"title":"State of the art in medical and industrial linear-accelerator systems","authors":"D. Whittum, M. Trail, G. E. Meddaugh","doi":"10.1109/IVELEC.2008.4556556","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556556","url":null,"abstract":"The state of the art in medical and industrial microwave accelerators is reviewed, with attention to the microwave system, structure design, performance and reliability.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125557030","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}
Pub Date : 2008-04-22DOI: 10.1109/IVELEC.2008.4556528
R. Miller, Y. Y. Lau, J. Booske
We extend the analysis of single rectangular-ridge field enhancement to the case of a double ridge.
我们将单矩形脊场增强的分析推广到双脊场的情况。
{"title":"Field enhancement on knife-edge cathodes","authors":"R. Miller, Y. Y. Lau, J. Booske","doi":"10.1109/IVELEC.2008.4556528","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556528","url":null,"abstract":"We extend the analysis of single rectangular-ridge field enhancement to the case of a double ridge.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129071582","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}
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