中国物理B ›› 2008, Vol. 17 ›› Issue (10): 3807-3811.doi: 10.1088/1674-1056/17/10/045

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Comparative research on three types of coaxial slow wave structures

肖仁珍, 刘国治, 陈昌华   

  1. Northwest Institute of Nuclear Technology, Xi'an { rm 710024, China
  • 收稿日期:2007-12-04 修回日期:2008-02-22 出版日期:2008-10-20 发布日期:2008-10-20

Comparative research on three types of coaxial slow wave structures

Xiao Ren-Zhen(肖仁珍)†, Liu Guo-Zhi(刘国治), and Chen Chang-Hua(陈昌华)   

  1. Northwest Institute of Nuclear Technology, Xi'an { rm 710024, China
  • Received:2007-12-04 Revised:2008-02-22 Online:2008-10-20 Published:2008-10-20

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摘要： This paper studies three types of coaxial slow wave structures (SWSs): (1) with ripples on both the inner and outer conductors; (2) with ripples on the outer conductor and smooth on the inner one; and (3) with ripples on the inner conductor and smooth on the outer one. The frequencies, coupling impedances, time growth rates and beam-wave interaction efficiencies of the three types of coaxial SWSs are obtained by theoretical analysis. Moreover, the relativistic Cerenkov generators (RCGs) with the three types of coaxial SWSs are simulated with a fully electromagnetic particle-in-cell code, and the results verify the theoretical analysis. It is proved that the RCG with double-rippled coaxial SWS has the highest conversion efficiency and the shortest starting time.

Abstract: This paper studies three types of coaxial slow wave structures (SWSs): (1) with ripples on both the inner and outer conductors; (2) with ripples on the outer conductor and smooth on the inner one; and (3) with ripples on the inner conductor and smooth on the outer one. The frequencies, coupling impedances, time growth rates and beam-wave interaction efficiencies of the three types of coaxial SWSs are obtained by theoretical analysis. Moreover, the relativistic Cerenkov generators (RCGs) with the three types of coaxial SWSs are simulated with a fully electromagnetic particle-in-cell code, and the results verify the theoretical analysis. It is proved that the RCG with double-rippled coaxial SWS has the highest conversion efficiency and the shortest starting time.

Key words: relativistic Cerenkov generator, coaxial slow wave structure, dispersion characteristics, particle-in-cell simulation

中图分类号:  (Radiowave and microwave (including millimeter wave) technology)

  • 84.40.-x
52.65.Rr (Particle-in-cell method)