Pub Date : 2008-04-22DOI: 10.1109/IVELEC.2008.4556542
D. S. Komm, D. Hoppe
This paper describes a miniature high voltage power supply for space use that is comparable to a TWTA EPC. The supply uses a gaseous mixture of SF6 and N2 for bulk high voltage insulation rather than a solid dielectric (i.e., potting). Experimental breakdown data show good agreement with ionization theory after accounting for geometrical effects typical of real power supplies. In the proper application, a gaseous dielectric is advantageous compared to potting for minimizing mass and volume. Gaseous dielectrics also offer certain manufacturing advantages such as guaranteed freedom from voids and ease of rework.
{"title":"Gaseous dielectric high voltage insulation for space applications","authors":"D. S. Komm, D. Hoppe","doi":"10.1109/IVELEC.2008.4556542","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556542","url":null,"abstract":"This paper describes a miniature high voltage power supply for space use that is comparable to a TWTA EPC. The supply uses a gaseous mixture of SF6 and N2 for bulk high voltage insulation rather than a solid dielectric (i.e., potting). Experimental breakdown data show good agreement with ionization theory after accounting for geometrical effects typical of real power supplies. In the proper application, a gaseous dielectric is advantageous compared to potting for minimizing mass and volume. Gaseous dielectrics also offer certain manufacturing advantages such as guaranteed freedom from voids and ease of rework.","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":"126131608","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.2008.4556471
B. Vancil, V. Schmidt, T. Monson, I. Brodie, W. Ohlinger, J. Shaw
We report improved emission from our miniature reservoir cathodes due to changes in emission material composition and processes. Also, the diffuser plug porosity and composition were adjusted. The activity curves on diode testers now exhibit knee temperatures of 970deg CB at 5 A/cm2. This is slightly above the ldquoMrdquo impregnated cathodes used as controls. Activation time was also reduced. The main improvement was introduction of sub-micron tungsten as activator in the reservoir and improved processes to protect emission material from water vapor. We present the data and describe the compositional and process changes that were made.
{"title":"Emission studies on reservoir cathodes","authors":"B. Vancil, V. Schmidt, T. Monson, I. Brodie, W. Ohlinger, J. Shaw","doi":"10.1109/IVELEC.2008.4556471","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556471","url":null,"abstract":"We report improved emission from our miniature reservoir cathodes due to changes in emission material composition and processes. Also, the diffuser plug porosity and composition were adjusted. The activity curves on diode testers now exhibit knee temperatures of 970deg CB at 5 A/cm2. This is slightly above the ldquoMrdquo impregnated cathodes used as controls. Activation time was also reduced. The main improvement was introduction of sub-micron tungsten as activator in the reservoir and improved processes to protect emission material from water vapor. We present the data and describe the compositional and process changes that were made.","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":"130546607","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.2008.4556457
J. Barroso, J. Leite Neto
Including a coaxial circular insert separated by a gap spacing from the cavity end, reentrant cavities with dimensions conveniently small can operate at large wavelengths, thereby finding direct application in klystron cavities for low frequencies. It is illustrated that a reentrant cavity 8.0 cm in diameter, loaded with a coaxial insert of radius 2.0 cm and a 2.0 mm gap spacing, resonates at a 30.0 cm wavelength (1.0 GHz).
包括与腔端间隔间隔的同轴圆形插入，尺寸小的可重入腔可以在大波长下工作，从而直接应用于低频速调管腔。结果表明，在直径为8.0 cm的重入腔中，加载半径为2.0 cm的同轴嵌件和2.0 mm的间隙间距，谐振波长为30.0 cm (1.0 GHz)。
{"title":"Resonance frequency and Ohmic Q factor in klystron cavities","authors":"J. Barroso, J. Leite Neto","doi":"10.1109/IVELEC.2008.4556457","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556457","url":null,"abstract":"Including a coaxial circular insert separated by a gap spacing from the cavity end, reentrant cavities with dimensions conveniently small can operate at large wavelengths, thereby finding direct application in klystron cavities for low frequencies. It is illustrated that a reentrant cavity 8.0 cm in diameter, loaded with a coaxial insert of radius 2.0 cm and a 2.0 mm gap spacing, resonates at a 30.0 cm wavelength (1.0 GHz).","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":"130956226","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.2008.4556463
J. Kou, T. Yan, Shilu Zhao, Qingji Li
Optimizing coupled-cavity traveling-wave tube (CCTWT) beam wave interaction (BWI) efficiency through tapering of the phase velocity could greatly increase RF output power. In order to do this work, a programme for CCTWT has been developed and implemented in BVERI. The programme could do multidimensional large-signal calculation of CCTWT and optimize the lengths of the individual cavities using simulated annealing algorithm. The optimization algorithm is described simply and computational results are present.
{"title":"Optimization of CCTWT BWI efficiency using annealing algorithm","authors":"J. Kou, T. Yan, Shilu Zhao, Qingji Li","doi":"10.1109/IVELEC.2008.4556463","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556463","url":null,"abstract":"Optimizing coupled-cavity traveling-wave tube (CCTWT) beam wave interaction (BWI) efficiency through tapering of the phase velocity could greatly increase RF output power. In order to do this work, a programme for CCTWT has been developed and implemented in BVERI. The programme could do multidimensional large-signal calculation of CCTWT and optimize the lengths of the individual cavities using simulated annealing algorithm. The optimization algorithm is described simply and computational results are present.","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":"125573220","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.2008.4556426
J. Welter, C. Marotta, R. True, T. Hargreaves, A. Donald, T. Schoemehl
Compact and lightweight, microwave amplifiers are increasingly needed for mobile Mil-Satcom communication requirements as well as compact radar applications. L-3 communications electron devices has developed a high performance low noise TWT for use in a microwave power module (MPM) with CW output powers of 200 watts in the 13-16 GHz communication band.
{"title":"Recent results on a 200W Ku-band power booster TWT","authors":"J. Welter, C. Marotta, R. True, T. Hargreaves, A. Donald, T. Schoemehl","doi":"10.1109/IVELEC.2008.4556426","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556426","url":null,"abstract":"Compact and lightweight, microwave amplifiers are increasingly needed for mobile Mil-Satcom communication requirements as well as compact radar applications. L-3 communications electron devices has developed a high performance low noise TWT for use in a microwave power module (MPM) with CW output powers of 200 watts in the 13-16 GHz communication band.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"21 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":"122201597","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.2008.4556394
T. Mitani, N. Shinohara, H. Matsumoto, M. Aiga, N. Kuwahara, T. Ishii
Axial distribution of the anode current in 2.45 GHz oven magnetrons was investigated with segmented-anode magnetrons. In the shielded-cathode magnetron, the anode current flew to the center of the anode vanes more than in the conventional-cathode magnetron.
{"title":"Experimental study on axial distribution of anode current in 2.45GHz oven magnetrons","authors":"T. Mitani, N. Shinohara, H. Matsumoto, M. Aiga, N. Kuwahara, T. Ishii","doi":"10.1109/IVELEC.2008.4556394","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556394","url":null,"abstract":"Axial distribution of the anode current in 2.45 GHz oven magnetrons was investigated with segmented-anode magnetrons. In the shielded-cathode magnetron, the anode current flew to the center of the anode vanes more than in the conventional-cathode magnetron.","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":"122284506","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.2008.4556504
S. Shin, H. Jung, S. Min, D. Kim, C.H. Kim, D. W. Yim, G. Park
A competition between two axial mode of TM01 is observed in the experiment of a L-band magnetically insulated transmission line oscillator (MILO) (D. H. Kim, et al., 2007). This mode competition can be affected by anode plasma formation during the operation. The transient time between two modes becomes shorter with additional anode plasma in MAGIC2D simulation.
在l波段磁绝缘传输线振荡器(MILO)的实验中观察到TM01的两个轴向模式之间的竞争(D. H. Kim等，2007)。这种模式竞争可能会受到阳极等离子体在操作过程中形成的影响。在MAGIC2D模拟中，增加阳极等离子体后，两种模式之间的瞬态时间变短。
{"title":"Effect of anode plasma on pulse shortening in magnetically insulated transmission line oscillator","authors":"S. Shin, H. Jung, S. Min, D. Kim, C.H. Kim, D. W. Yim, G. Park","doi":"10.1109/IVELEC.2008.4556504","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556504","url":null,"abstract":"A competition between two axial mode of TM01 is observed in the experiment of a L-band magnetically insulated transmission line oscillator (MILO) (D. H. Kim, et al., 2007). This mode competition can be affected by anode plasma formation during the operation. The transient time between two modes becomes shorter with additional anode plasma in MAGIC2D simulation.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"104 1-2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120896109","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.2008.4556452
P. Rao, S. K. Datta
This paper presents a simple method of estimating the attenuation constant due to conductivity losses and surface finish in a helix slow-wave structure, using the quality factor and dispersion characteristics obtainable from the eigen-mode solutions through 3D HFSS modeling. The method has been benchmarked against two practical structures published in the literature, and effect of surface finish on the attenuation constant is demonstrated.
{"title":"Estimation of conductivity losses in a helix slow-wave structure using eigen-mode solutions","authors":"P. Rao, S. K. Datta","doi":"10.1109/IVELEC.2008.4556452","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556452","url":null,"abstract":"This paper presents a simple method of estimating the attenuation constant due to conductivity losses and surface finish in a helix slow-wave structure, using the quality factor and dispersion characteristics obtainable from the eigen-mode solutions through 3D HFSS modeling. The method has been benchmarked against two practical structures published in the literature, and effect of surface finish on the attenuation constant is demonstrated.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"236 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":"121024920","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.2008.4556444
Shaolun Cai, Jinjun Feng
TWTRF2.0 codes, a 1D disc model based on Rowe theory, has been used to compute the effects of harmonic injection on fundamental wave growth and harmonic suppression. LMSuite, a program to calculate multi-tone operation, is used calculate IM3 suppression by signal injection, and we have got results according with experiment results.
{"title":"TWT Harmonic injection calculation and experiment","authors":"Shaolun Cai, Jinjun Feng","doi":"10.1109/IVELEC.2008.4556444","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556444","url":null,"abstract":"TWTRF2.0 codes, a 1D disc model based on Rowe theory, has been used to compute the effects of harmonic injection on fundamental wave growth and harmonic suppression. LMSuite, a program to calculate multi-tone operation, is used calculate IM3 suppression by signal injection, and we have got results according with experiment results.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"16 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":"121053768","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.2008.4556401
B. Held, J. Deford, J. Petillo, D. Panagos, E. Nelson, B. Levush
Next generation vacuum electron devices under development for millimeter and sub-millimeter wavelengths are often characterized by very small features that must be very precisely designed and manufactured for proper tube function and longevity. In this regime the need for automated physics-based optimization to aid the designer in meeting device performance specifications is much more critical than in larger, lower frequency devices where prototyping and experimentation are more readily performed. Recent work has been done on improving the ability of modeling and design simulation environments to aid the designer in finding optimum configurations. As the simulation tools have improved to enable first-pass design success in some cases, the potential benefits of optimization techniques become even more significant. This paper discusses methods for optimization of electron guns as well as multistage depressed collectors.
{"title":"Advanced electron guns and depressed collectors design and optimization using the MICHELLE / ANALYST Environment","authors":"B. Held, J. Deford, J. Petillo, D. Panagos, E. Nelson, B. Levush","doi":"10.1109/IVELEC.2008.4556401","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556401","url":null,"abstract":"Next generation vacuum electron devices under development for millimeter and sub-millimeter wavelengths are often characterized by very small features that must be very precisely designed and manufactured for proper tube function and longevity. In this regime the need for automated physics-based optimization to aid the designer in meeting device performance specifications is much more critical than in larger, lower frequency devices where prototyping and experimentation are more readily performed. Recent work has been done on improving the ability of modeling and design simulation environments to aid the designer in finding optimum configurations. As the simulation tools have improved to enable first-pass design success in some cases, the potential benefits of optimization techniques become even more significant. This paper discusses methods for optimization of electron guns as well as multistage depressed collectors.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"53 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":"115163020","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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