Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)最新文献_第5页

Powerful vacuum electron tubes used in European particle accelerators and thermonuclear fusion systems 欧洲粒子加速器和热核融合系统中使用的强力真空电子管

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999230

M. Thumm

引用次数: 0

Broadband efficient low-relativistic gyro-TWT with helically grooved waveguide 带螺旋槽波导的宽带高效低相对论陀螺行波管

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999422

V. Bratman, G. Denisov, G. Kalynova, V. Manuilov, M. Ofitserov, S. Samsonov, A. B. Volkov

{"title":"Broadband efficient low-relativistic gyro-TWT with helically grooved waveguide","authors":"V. Bratman, G. Denisov, G. Kalynova, V. Manuilov, M. Ofitserov, S. Samsonov, A. B. Volkov","doi":"10.1109/IVELEC.2002.999422","DOIUrl":"https://doi.org/10.1109/IVELEC.2002.999422","url":null,"abstract":"Summary form only given. The gyrotron traveling wave tube (gyro-TWT) is a well-known amplifier variety of the gyro-devices, which may have a wide instantaneous frequency bandwidth because of the operation with an electromagnetic wave possessing large group velocity. For a microwave system in the form of a smooth cylindrical waveguide a large wave group velocity inevitably leads to a large axial wavenumber, which makes this device significantly more sensitive to particle velocity spread in comparison with a gyrotron. The most favorable wave dispersion for a gyro-TWT is that when the wave group velocity is sufficiently large and constant in the region of close-to-zero axial wavenumber. A similar dispersion can be realized in an oversized circular waveguide with special helical ripples of its inner surface A theoretical analysis demonstrates important advantages of the \"helical\" gyro-TWTs over the analogous \"smooth\" ones in sensitivity to electron velocity spread, frequency bandwidth and stability to parasitic self-oscillations. The proof-of-principle experiments exploiting moderately relativistic (200-300 keV) short-pulse (20-100 ns) field-emission electron beams have proved the main theoretical predictions. Based on the first successful experiments and the developed theory, a project was started aimed at the creation of a more applicable device. The main goal of this project is the realization of a Ka-band gyro-TWT with a low-relativistic electron beam produced by a gun with a thermionic cathode.","PeriodicalId":344852,"journal":{"name":"Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134152337","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}

引用次数: 19

Ka-band fundamental-mode peniotron with high device efficiency 器件效率高的ka波段基模回旋加速器

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999333

L. Dressman, D. Mcdermott, N. Luhmann, D. Gallagher, T. Spencer

{"title":"Ka-band fundamental-mode peniotron with high device efficiency","authors":"L. Dressman, D. Mcdermott, N. Luhmann, D. Gallagher, T. Spencer","doi":"10.1109/IVELEC.2002.999333","DOIUrl":"https://doi.org/10.1109/IVELEC.2002.999333","url":null,"abstract":"Summary form only given. The peniotron interaction has been proven capable of yielding extremely high electronic conversion efficiency. Efficiency has been demonstrated as high as 75% (Ishihara et al, 1999) and greater than 80% has been predicted. This inherently high efficiency is due to the nature of the interaction. In the peniotron, the electrons move forward in phase by 360/spl deg/ with each cyclotron orbit. Therefore, the electrons see the transverse component of the resonant wave as a \"DC\" electric field, experience E/spl times/B drift, and lose their transverse energy to the wave. This interaction is optimal for an axis encircling electron beam and for a well designed device (with a high quality beam), the transfer of transverse energy can approach 100% for all electrons in the beam. While high conversion efficiency has been demonstrated, practical application of the peniotron requires that high power be efficiently extracted from the device while immunity from competing gyrotron modes is maintained. The objective of the UCD harmonic peniotron is to achieve high overall device efficiency while insuring stability through the use of a fundamental mode interaction with the second cyclotron harmonic of an axis-encircling beam generated by a Northrop Grumman Cusp gun.","PeriodicalId":344852,"journal":{"name":"Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)","volume":"243 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131877610","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}

引用次数: 0

TWT with combined gyroresonance-gyrotons type of interaction of the waves modes E/sub 11/ and H/sub 11/ with the helical electrons beam in goffered waveguide 波模E/sub - 11/和H/sub - 11/与波导中螺旋电子束相互作用的组合回旋共振-回旋子型行波管

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999295

S. Kolosov

引用次数: 0

K-band vacuum electron tubes for materials processing: present and future 用于材料加工的k波段真空电子管:现在与未来

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999428

M. Thumm, L. Feher

引用次数: 0

Development update of a 10 MW, 91 GHz gyroklystron 10兆瓦，91 GHz回旋速调管的开发更新

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999275

J. Neilson, R. Ives, M. Read, M. Mizuhara, T. Robinson, D. Marsden, W. Lawson, B. Hogan

引用次数: 0

Klystron with ring resonators for accelerators 带环形谐振器的速调管用于加速器

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999370

I.A. Freydovich, N.A. Kokorev, S. N. Nazarov, V.I. Pasmannik, M.Yu. Vorobiyev, E. P. Yakushkin

引用次数: 3

Investigation to reduce ion noise and body current behavior in continuous wave traveling wave tubes 降低连续波行波管中离子噪声和体电流行为的研究

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999414

D. Thelen, R. Emerson

引用次数: 0

High-current processing of microfabricated field emitters for enhanced emission uniformity and high-current-density operation 增强发射均匀性和高电流密度操作的微加工场致发射体的大电流加工

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999263

P. Schwoebel, C. Spindt, C. Holland

引用次数: 2

Design and development of high power window for linear accelerator at 2.856 GHz 2.856 GHz线性加速器大功率窗口的设计与开发

Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524) Pub Date : 2002-08-07 DOI: 10.1109/IVELEC.2002.999431

T. Tiwari, A. Shah, C.S. Nainwad

{"title":"Design and development of high power window for linear accelerator at 2.856 GHz","authors":"T. Tiwari, A. Shah, C.S. Nainwad","doi":"10.1109/IVELEC.2002.999431","DOIUrl":"https://doi.org/10.1109/IVELEC.2002.999431","url":null,"abstract":"This paper deals with design and development of high power RF window for S-band linear accelerator at spot frequency 2.856 GHz which is capable of handling peak and average powers of 6 MW and 25 kW, respectively, with VSWR and insertion loss 1.1 and 0.1 dB, respectively. The HFSS software is used for computation of diameter and thickness of ceramic and other required parameters. Further, analytical technique is used for calculation of inner diameter of water pipe for effective cooling. All parts of window are fabricated. The window is assembled and tested. The theoretical values of VSWR, insertion loss, and return loss are found in good agreement with corresponding experimental values. Further the effect of variation of thickness, dielectric constant of ceramic and frequency is also studied and it is found that VSWR, insertion loss and return loss are affected. The output parameters are computed with the help of HFSS software. The inner diameter of the adopter used for cooling is calculated with the help analytical technique and it is found to be 5 mm. The essential parts of the window are ceramic, ceramic holding circular waveguide, outer circular waveguide with water adopter, standard waveguide flange, and UHV conflate flange.","PeriodicalId":344852,"journal":{"name":"Third IEEE International Vacuum Electronics Conference (IEEE Cat. No.02EX524)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114664419","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}

引用次数: 3