Pub Date : 2008-04-22DOI: 10.1109/IVELEC.2008.4556342
S. Cooke
We describe a new simulation technique to find the resonant frequencies and Qs of cavity eigenmodes when the cavity is coupled to an external waveguide. The method treats the cavity first as a closed system to find a set of lossless eigenmodes, then couples this system to a representation of the external waveguide to determine the coupled mode frequency and Qexternal. There is no assumption of weak coupling, and the technique is ideal for the analysis of very low-Q output cavities for RF amplifiers.
{"title":"Numerical modeling of cavities with low external Q","authors":"S. Cooke","doi":"10.1109/IVELEC.2008.4556342","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556342","url":null,"abstract":"We describe a new simulation technique to find the resonant frequencies and Qs of cavity eigenmodes when the cavity is coupled to an external waveguide. The method treats the cavity first as a closed system to find a set of lossless eigenmodes, then couples this system to a representation of the external waveguide to determine the coupled mode frequency and Qexternal. There is no assumption of weak coupling, and the technique is ideal for the analysis of very low-Q output cavities for RF amplifiers.","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":"123976300","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.2008.4556447
M. Fuks, E. Schamiloglu
In the present work we suggest to use cyclotron absorption to suppress a wave that is responsible for feedback in traveling wave tubes (TWTs) without removing reflections and other causes of parasitic self-excitation that can lead to controlled gain by varying the magnitude of the guide magnetic field inside the stationary region of cyclotron absorption (RCA). We illustrate amplification in the RCA using a self-consistent theory of stationary operation of a TWT accounting for the cyclotron resonance of electrons with the wave that is responsible for positive feedback, and interaction of electrons with the forward wave accounting for the condition of Cherenkov synchronism.
{"title":"Amplification and frequency-locking in a TWT using cyclotron depression of positive feedback","authors":"M. Fuks, E. Schamiloglu","doi":"10.1109/IVELEC.2008.4556447","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556447","url":null,"abstract":"In the present work we suggest to use cyclotron absorption to suppress a wave that is responsible for feedback in traveling wave tubes (TWTs) without removing reflections and other causes of parasitic self-excitation that can lead to controlled gain by varying the magnitude of the guide magnetic field inside the stationary region of cyclotron absorption (RCA). We illustrate amplification in the RCA using a self-consistent theory of stationary operation of a TWT accounting for the cyclotron resonance of electrons with the wave that is responsible for positive feedback, and interaction of electrons with the forward wave accounting for the condition of Cherenkov synchronism.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"2 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":"121307483","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.2008.4556429
M. Petelin, M.B. Salin, D. Shchegolkov, N. Zaitsev, V. Erckmann, J. Hirshfield, W. Kasparek
The paper describes some new oversized, quasi-optical, electrodynamic components applicable to high-power millimeter-wave systems.
本文介绍了一些适用于大功率毫米波系统的新型超大准光学电动力元件。
{"title":"New elements for controlled gyrotron systems","authors":"M. Petelin, M.B. Salin, D. Shchegolkov, N. Zaitsev, V. Erckmann, J. Hirshfield, W. Kasparek","doi":"10.1109/IVELEC.2008.4556429","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556429","url":null,"abstract":"The paper describes some new oversized, quasi-optical, electrodynamic components applicable to high-power millimeter-wave systems.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"177 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":"114063284","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.2008.4556427
M. Barsanti, C. Wheeland, M. Boyle
The development of a new, high power ring-bar TWT is described. The computer aided design tools used are presented and comparisons between simulation results and acquired data are shown.
{"title":"L-band ring-bar TWT development","authors":"M. Barsanti, C. Wheeland, M. Boyle","doi":"10.1109/IVELEC.2008.4556427","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556427","url":null,"abstract":"The development of a new, high power ring-bar TWT is described. The computer aided design tools used are presented and comparisons between simulation results and acquired data are shown.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"35 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":"124135024","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.2008.4556511
Ming-Chieh Lin, P. Chang
We use FDTD PIC codes to simulation virtual cathode oscillators and employ three analytical models and an empirical estimation to determine the corresponding frequencies of oscillations to help understand the vircator.
{"title":"Study on virtual cathode oscillations by using finite difference time domain particle-in-cell codes","authors":"Ming-Chieh Lin, P. Chang","doi":"10.1109/IVELEC.2008.4556511","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556511","url":null,"abstract":"We use FDTD PIC codes to simulation virtual cathode oscillators and employ three analytical models and an empirical estimation to determine the corresponding frequencies of oscillations to help understand the vircator.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"149 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":"122257789","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.2008.4556404
T. Anatoliy, V. Daniel, P. Sergiy, P. Varvara, F. Vladimir
Results of Ukrainian researchers on development, emission properties investigations and applications of cathode materials based on LaB6, LaB6-MeIV-VIB2 and also impregnated and pressed oxide cathodes are presented.
{"title":"Modern state of cathode development and emission properties investigations in Ukraine","authors":"T. Anatoliy, V. Daniel, P. Sergiy, P. Varvara, F. Vladimir","doi":"10.1109/IVELEC.2008.4556404","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556404","url":null,"abstract":"Results of Ukrainian researchers on development, emission properties investigations and applications of cathode materials based on LaB<sub>6</sub>, LaB<sub>6</sub>-Me<sup>IV-VI</sup>B<sub>2</sub> and also impregnated and pressed oxide cathodes are presented.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"6 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":"115908392","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.2008.4556461
A. Arkhipov, A. Darmaev, D. Komarov, Y.A. Miroshnikov, S. Morev, A. V. Fetisova
The results of the theoretical and experimental investigations of the spatial extensive and intense electron beam in the nonsinusoidal PPM focusing system are presented.
本文介绍了非正弦PPM聚焦系统中空间宽强电子束的理论和实验研究结果。
{"title":"Transport of an electron beam in the periodical nonsinusoidal magnetic fields","authors":"A. Arkhipov, A. Darmaev, D. Komarov, Y.A. Miroshnikov, S. Morev, A. V. Fetisova","doi":"10.1109/IVELEC.2008.4556461","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556461","url":null,"abstract":"The results of the theoretical and experimental investigations of the spatial extensive and intense electron beam in the nonsinusoidal PPM focusing system are presented.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"76 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":"132251848","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.2008.4556389
Setha Yim, Riichiro Ohta, Jessie L. Killian, Nathaniel B. Zuckerman, Emily Allen, Cattien V. Nguyen
In this paper, we demonstrate enhanced field emission properties from MWNT emitters grown directly on the 80/20 NiCr alloy surface due to the grain boundary effect. The elemental segregation was clearly demonstrated by AES elemental mapping, where Cr and O surface segregation inhibited MWNT growth. The potential for this simple process is that it may be employed for fabricating CNT emitters without requiring any metal deposition step nor microlithography 3. process in order to minimize the field screening effect.
{"title":"Enhanced field emission properties from carbon nanotube emitters grown on NiCr alloy surfaces with grain boundary effect","authors":"Setha Yim, Riichiro Ohta, Jessie L. Killian, Nathaniel B. Zuckerman, Emily Allen, Cattien V. Nguyen","doi":"10.1109/IVELEC.2008.4556389","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556389","url":null,"abstract":"In this paper, we demonstrate enhanced field emission properties from MWNT emitters grown directly on the 80/20 NiCr alloy surface due to the grain boundary effect. The elemental segregation was clearly demonstrated by AES elemental mapping, where Cr and O surface segregation inhibited MWNT growth. The potential for this simple process is that it may be employed for fabricating CNT emitters without requiring any metal deposition step nor microlithography 3. process in order to minimize the field screening effect.","PeriodicalId":113971,"journal":{"name":"2008 IEEE International Vacuum Electronics Conference","volume":"22 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":"130902008","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.2008.4556321
J. Tucek, D. Gallagher, K. Kreischer, R. Mihailovich
Northrop Grumman Corp. (NGC) has continued to develop a VE-based folded waveguide (FWG) technology as part of DARPA's terahertz imaging focal plane array technology (TIFT) source development program. The THz source consists of a thermionic electron gun, a FWG regenerative oscillator circuit, a depressed collector, and a 10 kG Nd-Fe-B permanent magnet solenoid to confine the electron beam. Significant improvements have been made to the compact THz source, increasing the output power, efficiency, and operational duty cycle.
{"title":"A compact, high power, 0.65 THz source","authors":"J. Tucek, D. Gallagher, K. Kreischer, R. Mihailovich","doi":"10.1109/IVELEC.2008.4556321","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556321","url":null,"abstract":"Northrop Grumman Corp. (NGC) has continued to develop a VE-based folded waveguide (FWG) technology as part of DARPA's terahertz imaging focal plane array technology (TIFT) source development program. The THz source consists of a thermionic electron gun, a FWG regenerative oscillator circuit, a depressed collector, and a 10 kG Nd-Fe-B permanent magnet solenoid to confine the electron beam. Significant improvements have been made to the compact THz source, increasing the output power, efficiency, and operational duty cycle.","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":"134461929","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.2008.4556359
R. Carter, R. Jenkins
This paper describes a theoretical model for the small-signal transient behaviour of a klystron. Comparisons are made between results obtained from the model and those of experimental measurements.
本文描述了速调管小信号瞬态特性的理论模型。并将模型计算结果与实验测量结果进行了比较。
{"title":"Studies of the transient response of a klystron","authors":"R. Carter, R. Jenkins","doi":"10.1109/IVELEC.2008.4556359","DOIUrl":"https://doi.org/10.1109/IVELEC.2008.4556359","url":null,"abstract":"This paper describes a theoretical model for the small-signal transient behaviour of a klystron. Comparisons are made between results obtained from the model and those of experimental measurements.","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":"115929286","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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