Pub Date : 2008-04-22DOI: 10.1109/IVELEC.2008.4556349
J. Tarter, M. Effgen, F. Pušavec, I. Jawahir
This paper presents the results of initial experiments to apply cryogenic methods to the machining of porous tungsten for dispenser cathode matrices. The resulting surfaces were analyzed to determine their suitability for dispenser cathodes.
{"title":"Cryogenic machining of porous tungsten for dispenser cathode applications","authors":"J. Tarter, M. Effgen, F. Pušavec, I. Jawahir","doi":"10.1109/IVELEC.2008.4556349","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556349","url":null,"abstract":"This paper presents the results of initial experiments to apply cryogenic methods to the machining of porous tungsten for dispenser cathode matrices. The resulting surfaces were analyzed to determine their suitability for dispenser cathodes.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"61 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":"127668823","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.2008.4556450
R. Martorana, A. Nicosia
Telecommunication transmissions require high power linear amplifiers operating in C, X and Ku bands due to the necessity to manage a large amount of information. Helix TWT is the device adequate for this application since it can provide wide bandwidth and high power level at high frequencies. One of the major difficulties in the design of a wide band TWT relies in the phase velocity dispersion of the helix circuit because the gain across the band is strictly depending on it. For this reason the control of the helix dispersion characteristics has represented and still represents one of the more important techniques in broad band helix TWT design. To this purpose an anisotropic loading structure, consisting of "semi-metallic rods", has been designed and cold tested. The results are presented in this paper.
{"title":"“Semi-metallic rods” structure for controlling the phase velocity dispersion in helix TWT","authors":"R. Martorana, A. Nicosia","doi":"10.1109/IVELEC.2008.4556450","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556450","url":null,"abstract":"Telecommunication transmissions require high power linear amplifiers operating in C, X and Ku bands due to the necessity to manage a large amount of information. Helix TWT is the device adequate for this application since it can provide wide bandwidth and high power level at high frequencies. One of the major difficulties in the design of a wide band TWT relies in the phase velocity dispersion of the helix circuit because the gain across the band is strictly depending on it. For this reason the control of the helix dispersion characteristics has represented and still represents one of the more important techniques in broad band helix TWT design. To this purpose an anisotropic loading structure, consisting of \"semi-metallic rods\", has been designed and cold tested. The results are presented in this paper.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"37 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":"127759683","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.2008.4556387
K. A. Zaitsev, V. M. Pikunov, A. N. Sandalov, Yao-gen Ding, Bin Shen
Electrodynamic parameters of complicated output RF systems of multiple-beam klystron are under research in this article. The gain-frequency characteristic was obtained, values of operating frequencies, loaded and unloaded Q-factors, R/Q values and interaction coefficients of the double-gap output cavity with matching system and output waveguide were calculated. Dependence of external Q-factor from coupling diaphragm proportions was investigated. The recommendations to improve the parameters of the output multiple-beam system were issued.
{"title":"Electrodynamic parameters of the double-gap output structure for multiple-beam klystron","authors":"K. A. Zaitsev, V. M. Pikunov, A. N. Sandalov, Yao-gen Ding, Bin Shen","doi":"10.1109/IVELEC.2008.4556387","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556387","url":null,"abstract":"Electrodynamic parameters of complicated output RF systems of multiple-beam klystron are under research in this article. The gain-frequency characteristic was obtained, values of operating frequencies, loaded and unloaded Q-factors, R/Q values and interaction coefficients of the double-gap output cavity with matching system and output waveguide were calculated. Dependence of external Q-factor from coupling diaphragm proportions was investigated. The recommendations to improve the parameters of the output multiple-beam system were issued.","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":"131798101","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.2008.4556454
Yu-he Dong, Liu Xiao, Yao-gen Ding, Jinlin Yang
The configuration of aperture coupling of coaxial output cavity with shift-tubes to output rectangular waveguide of klystron is designed. The smith-chart, one-port complex reflecting coefficient and loaded quality factor of transverse magnetic higher mode TM310 in cavity resonator coupling to transverse electric fundamental mode TE10 in waveguide is investigated based on theory of one-port network theory and simulated with high frequency electromagnetic simulator. The impact of rectangular coupling aperture sizes on loaded quality factor is displayed.
{"title":"Aperture coupling of coaxial cavity to rectangular waveguide","authors":"Yu-he Dong, Liu Xiao, Yao-gen Ding, Jinlin Yang","doi":"10.1109/IVELEC.2008.4556454","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556454","url":null,"abstract":"The configuration of aperture coupling of coaxial output cavity with shift-tubes to output rectangular waveguide of klystron is designed. The smith-chart, one-port complex reflecting coefficient and loaded quality factor of transverse magnetic higher mode TM310 in cavity resonator coupling to transverse electric fundamental mode TE10 in waveguide is investigated based on theory of one-port network theory and simulated with high frequency electromagnetic simulator. The impact of rectangular coupling aperture sizes on loaded quality factor is displayed.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"156-157 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":"133061014","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.2008.4556329
Jinshu Wang, Lili Li, Yiman Wang, Yanchun Wang, W. Liu, A. Srivastava, J. So, G. Park
High current density sheet beams directly generated from cathodes have been developed and reported in this paper.
本文报道了一种由阴极直接产生的高电流密度板束。
{"title":"Development of high current density sheet beams for THz sources","authors":"Jinshu Wang, Lili Li, Yiman Wang, Yanchun Wang, W. Liu, A. Srivastava, J. So, G. Park","doi":"10.1109/IVELEC.2008.4556329","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556329","url":null,"abstract":"High current density sheet beams directly generated from cathodes have been developed and reported in this paper.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"40 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":"116272705","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.2008.4556425
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.2008.4556343
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.2008.4556556
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}
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