Pub Date : 2011-02-21DOI: 10.1109/IVEC.2011.5747097
P. Srikrishna, P. V. S. Rao, S. Subramanian, L. Kumar
The conventional method of cooling the electronics by a cold plate, forces the electronic designer to spread all the heat dissipating components in single plane at the bottom. The proposed scheme, allows to populate the electronics is on both sides of the plate thus increasing the packing density and decreasing the volume. The various layout options, with the improved cooling were analyzed, using FloTHERM for fluid flow and heat transfer to arrive at a module with improved electronic performance, greater reliability, smaller volume (75% of the existing unit) and lesser weight (nearly 50 % of the existing unit). The chassis was fabricated with the most optimum layout and the test results show a highly favorable temperature distribution.
{"title":"Embedded cooling scheme to increase the electronics packing density for MPM","authors":"P. Srikrishna, P. V. S. Rao, S. Subramanian, L. Kumar","doi":"10.1109/IVEC.2011.5747097","DOIUrl":"https://doi.org/10.1109/IVEC.2011.5747097","url":null,"abstract":"The conventional method of cooling the electronics by a cold plate, forces the electronic designer to spread all the heat dissipating components in single plane at the bottom. The proposed scheme, allows to populate the electronics is on both sides of the plate thus increasing the packing density and decreasing the volume. The various layout options, with the improved cooling were analyzed, using FloTHERM for fluid flow and heat transfer to arrive at a module with improved electronic performance, greater reliability, smaller volume (75% of the existing unit) and lesser weight (nearly 50 % of the existing unit). The chassis was fabricated with the most optimum layout and the test results show a highly favorable temperature distribution.","PeriodicalId":106174,"journal":{"name":"2011 IEEE International Vacuum Electronics Conference (IVEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130878020","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 : 2011-02-21DOI: 10.1109/IVEC.2011.5746883
R. Lakshminarasimhan, V. Venkatesh, M. Ravindra, T. S. Nanjundaswamy
Indigenous development of TWT has been successfully achieved by the joined efforts of CEERI and BEL with ISRO support for space adaptation and qualification. Flight Model 60W C-Band TWT has been successfully designed, fabricated and qualified.
{"title":"Development of 60 W C-Band TWT for space","authors":"R. Lakshminarasimhan, V. Venkatesh, M. Ravindra, T. S. Nanjundaswamy","doi":"10.1109/IVEC.2011.5746883","DOIUrl":"https://doi.org/10.1109/IVEC.2011.5746883","url":null,"abstract":"Indigenous development of TWT has been successfully achieved by the joined efforts of CEERI and BEL with ISRO support for space adaptation and qualification. Flight Model 60W C-Band TWT has been successfully designed, fabricated and qualified.","PeriodicalId":106174,"journal":{"name":"2011 IEEE International Vacuum Electronics Conference (IVEC)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130898713","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 : 2011-02-21DOI: 10.1109/IVEC.2011.5747011
M. J. Duffield, R. North
A new GyroTWA Amplifier has been developed to provide broad bandwidth capability at microwave power levels in excess of 150kW. The construction of the first fully sealed off GyroTWA is now complete and requires no auxiliary pumping system to maintain its vacuum integrity.
{"title":"Manufacture and evaluation of a GyroTWA amplifier","authors":"M. J. Duffield, R. North","doi":"10.1109/IVEC.2011.5747011","DOIUrl":"https://doi.org/10.1109/IVEC.2011.5747011","url":null,"abstract":"A new GyroTWA Amplifier has been developed to provide broad bandwidth capability at microwave power levels in excess of 150kW. The construction of the first fully sealed off GyroTWA is now complete and requires no auxiliary pumping system to maintain its vacuum integrity.","PeriodicalId":106174,"journal":{"name":"2011 IEEE International Vacuum Electronics Conference (IVEC)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127965627","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 : 2011-02-21DOI: 10.1109/IVEC.2011.5747066
M. Balk
The modelling of magnetrons compared to other tubes is more difficult since it requires 3D modelling rather than a 2D investigation. This is not only due to the geometry which can include complicated details to be modeled in 3D but also due to the interaction process itself: The electric field, magnetic field and particle movement span a 3D space. In this paper3D simulations of a strapped magnetron with CST STUDIO SUITE™ are presented.
与其他管相比，磁控管的建模更加困难，因为它需要3D建模而不是2D研究。这不仅是因为几何结构包含复杂的细节，需要在3D中建模，还因为相互作用过程本身:电场、磁场和粒子运动跨越3D空间。本文利用CST STUDIO SUITE™软件对一个磁控管进行了三维仿真。
{"title":"3D Magnetron simulation with CST STUDIO SUITE™","authors":"M. Balk","doi":"10.1109/IVEC.2011.5747066","DOIUrl":"https://doi.org/10.1109/IVEC.2011.5747066","url":null,"abstract":"The modelling of magnetrons compared to other tubes is more difficult since it requires 3D modelling rather than a 2D investigation. This is not only due to the geometry which can include complicated details to be modeled in 3D but also due to the interaction process itself: The electric field, magnetic field and particle movement span a 3D space. In this paper3D simulations of a strapped magnetron with CST STUDIO SUITE™ are presented.","PeriodicalId":106174,"journal":{"name":"2011 IEEE International Vacuum Electronics Conference (IVEC)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125453622","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 : 2011-02-21DOI: 10.1109/IVEC.2011.5746938
A. Nehra, L. M. Joshi, S. Kaushik, R. K. Gupta
Conventional microwave tubes generally use cylindrical electron beam coaxial to RF interaction circuit for generation or amplification of microwave signals. Many performance limitations these tubes in respect of band width, efficiency, voltage break have been addressed by emerging multi-beam technology which uses several low perveance electron beams in place of single beam used in conventional tubes. Design and development of a four beam electron gun is being attempted at CEERI with an aim to develop a multi-beam klystron. An approach has been developed to design four beam electron gun and focusing system. Effect of pole pieces for confinement of beam is studied and a proper pole piece size and shape is investigated using software OPERA 3D and OmniTrak simulation codes to enhance laminarity of beam. The paper presents the some of design results.
{"title":"Effect of aperture in a pole piece for focusing of multi beam electron gun","authors":"A. Nehra, L. M. Joshi, S. Kaushik, R. K. Gupta","doi":"10.1109/IVEC.2011.5746938","DOIUrl":"https://doi.org/10.1109/IVEC.2011.5746938","url":null,"abstract":"Conventional microwave tubes generally use cylindrical electron beam coaxial to RF interaction circuit for generation or amplification of microwave signals. Many performance limitations these tubes in respect of band width, efficiency, voltage break have been addressed by emerging multi-beam technology which uses several low perveance electron beams in place of single beam used in conventional tubes. Design and development of a four beam electron gun is being attempted at CEERI with an aim to develop a multi-beam klystron. An approach has been developed to design four beam electron gun and focusing system. Effect of pole pieces for confinement of beam is studied and a proper pole piece size and shape is investigated using software OPERA 3D and OmniTrak simulation codes to enhance laminarity of beam. The paper presents the some of design results.","PeriodicalId":106174,"journal":{"name":"2011 IEEE International Vacuum Electronics Conference (IVEC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126285993","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 : 2011-02-21DOI: 10.1109/IVEC.2011.5747003
A. Galdetskiy
An alternative design of multibeam klystron is considered. It enables significant compression of the beams and moderate partial perveances making possible significant bandwidth increasing.
提出了一种多波束速调管的设计方案。它能够显著压缩波束和适度的部分性能，使显著的带宽增加成为可能。
{"title":"On the opportunity of bandwidth increasing in multibeam klystron with planar layout of the beams","authors":"A. Galdetskiy","doi":"10.1109/IVEC.2011.5747003","DOIUrl":"https://doi.org/10.1109/IVEC.2011.5747003","url":null,"abstract":"An alternative design of multibeam klystron is considered. It enables significant compression of the beams and moderate partial perveances making possible significant bandwidth increasing.","PeriodicalId":106174,"journal":{"name":"2011 IEEE International Vacuum Electronics Conference (IVEC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121720893","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 : 2011-02-21DOI: 10.1109/IVEC.2011.5746979
A. Samartsev, G. Gantenbein, G. Dammertz, S. Illy, S. Kern, W. Leonhardt, A. Schlaich, M. Schmid, M. Thumm
Effective control of power absorption in tokamaks and stellarators could be achieved by the frequency tuning of ECH&CD power delivered by high-power gyrotrons. In this report some results of the development of a frequency tunable gyrotron with fused-silica Brewster window are presented. Excitation of several modes at 1 MW power level in the range of frequencies from 131 to 146.5 GHz is achieved. produced
{"title":"Development of frequency step tunable 1 MW gyrotron at 131 to 146.5 GHz","authors":"A. Samartsev, G. Gantenbein, G. Dammertz, S. Illy, S. Kern, W. Leonhardt, A. Schlaich, M. Schmid, M. Thumm","doi":"10.1109/IVEC.2011.5746979","DOIUrl":"https://doi.org/10.1109/IVEC.2011.5746979","url":null,"abstract":"Effective control of power absorption in tokamaks and stellarators could be achieved by the frequency tuning of ECH&CD power delivered by high-power gyrotrons. In this report some results of the development of a frequency tunable gyrotron with fused-silica Brewster window are presented. Excitation of several modes at 1 MW power level in the range of frequencies from 131 to 146.5 GHz is achieved. produced","PeriodicalId":106174,"journal":{"name":"2011 IEEE International Vacuum Electronics Conference (IVEC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125151754","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 : 2011-02-21DOI: 10.1109/IVEC.2011.5747102
Chen Guo, Z. Duan, Jucheng Lu, Min Chen
On the basis of the microscopic electromagnetic theory and the precious research results of the Cherenkov radiation, and in the case of that a single charged particle moves in the vacuum and over the isotropic DNMs, we derived the analytical expressions for Cherenkov radiation condition, the field components, and the total radiated energy per unit length of path. We numerically studied the effects of material loss and the particle velocity on the total radiated energy per unit length of path.
{"title":"Reversed Cherenkov radiation in a half space","authors":"Chen Guo, Z. Duan, Jucheng Lu, Min Chen","doi":"10.1109/IVEC.2011.5747102","DOIUrl":"https://doi.org/10.1109/IVEC.2011.5747102","url":null,"abstract":"On the basis of the microscopic electromagnetic theory and the precious research results of the Cherenkov radiation, and in the case of that a single charged particle moves in the vacuum and over the isotropic DNMs, we derived the analytical expressions for Cherenkov radiation condition, the field components, and the total radiated energy per unit length of path. We numerically studied the effects of material loss and the particle velocity on the total radiated energy per unit length of path.","PeriodicalId":106174,"journal":{"name":"2011 IEEE International Vacuum Electronics Conference (IVEC)","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114301040","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 : 2011-02-21DOI: 10.1109/IVEC.2011.5746983
J. Barroso
We demonstrate that on considering an electric-field longitudinal profile in the shape of a two-level transition curve the monotron conversion efficiency can attain values in excess of 30%, 1.5 times as high as that obtained from the conventional uniform field distribution. This is accomplished by using two cavities electromagnetically coupled by an annular slit crossed by an electron stream. A two-cavity monotron is developed to operate in the TM020 mode at 6.6 GHz when self-excited by a 20 keV, 50 A hollow electron beam. The device operation is examined through a 21/2-D particle-in-cell (PIC) simulation giving a 33.0% conversion efficiency.
{"title":"Coupled-cavity monotron","authors":"J. Barroso","doi":"10.1109/IVEC.2011.5746983","DOIUrl":"https://doi.org/10.1109/IVEC.2011.5746983","url":null,"abstract":"We demonstrate that on considering an electric-field longitudinal profile in the shape of a two-level transition curve the monotron conversion efficiency can attain values in excess of 30%, 1.5 times as high as that obtained from the conventional uniform field distribution. This is accomplished by using two cavities electromagnetically coupled by an annular slit crossed by an electron stream. A two-cavity monotron is developed to operate in the TM020 mode at 6.6 GHz when self-excited by a 20 keV, 50 A hollow electron beam. The device operation is examined through a 21/2-D particle-in-cell (PIC) simulation giving a 33.0% conversion efficiency.","PeriodicalId":106174,"journal":{"name":"2011 IEEE International Vacuum Electronics Conference (IVEC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125277687","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 : 2011-02-21DOI: 10.1109/IVEC.2011.5746967
Xiaofeng Zhang, C. Ruan, Jirun Luo, W. Ruan, Ying Han, Ding Zhao
The sheet beam klystron (SBK) is characterized by a large rectangular drift tube, which allows the use of a high current, low voltage beam, resulting in a low beam current density, and hence high efficiency and the possibility of Periodic Permanent Magnet (PPM) focusing. Our research group has designed a 5-Cavity X-Band SBK recently. In this paper, we discusses the general design of this X-Band SBK and presents the transfer characteristic of it predicted by a large signal code we developed.
{"title":"X-Band sheet beam klystron design","authors":"Xiaofeng Zhang, C. Ruan, Jirun Luo, W. Ruan, Ying Han, Ding Zhao","doi":"10.1109/IVEC.2011.5746967","DOIUrl":"https://doi.org/10.1109/IVEC.2011.5746967","url":null,"abstract":"The sheet beam klystron (SBK) is characterized by a large rectangular drift tube, which allows the use of a high current, low voltage beam, resulting in a low beam current density, and hence high efficiency and the possibility of Periodic Permanent Magnet (PPM) focusing. Our research group has designed a 5-Cavity X-Band SBK recently. In this paper, we discusses the general design of this X-Band SBK and presents the transfer characteristic of it predicted by a large signal code we developed.","PeriodicalId":106174,"journal":{"name":"2011 IEEE International Vacuum Electronics Conference (IVEC)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121783876","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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