中国物理B ›› 2009, Vol. 18 ›› Issue (7): 2749-2756.doi: 10.1088/1674-1056/18/7/021

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Small-signal analysis of a rectangular helix structure traveling-wave-tube

付成芳, 魏彦玉, 段兆云, 王文祥, 宫玉彬   

  1. National Key Laboratory of High Power Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China
  • 收稿日期:2008-10-18 修回日期:2008-11-10 出版日期:2009-07-20 发布日期:2009-07-20
  • 基金资助:
    Project supported in part by the National Natural Science Foundation of China (Grant No 60532010) and the Talent Fund of Chinese Education Administration.

Small-signal analysis of a rectangular helix structure traveling-wave-tube

Fu Cheng-Fang(付成芳)†, Wei Yan-Yu(魏彦玉)‡, Duan Zhao-Yun(段兆云), Wang Wen-Xiang(王文祥), and Gong Yu-Bin(宫玉彬)\S   

  1. National Key Laboratory of High Power Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China
  • Received:2008-10-18 Revised:2008-11-10 Online:2009-07-20 Published:2009-07-20
  • Supported by:
    Project supported in part by the National Natural Science Foundation of China (Grant No 60532010) and the Talent Fund of Chinese Education Administration.

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摘要： This paper investigates the properties of traveling wave-beam interaction in a rectangular helix traveling-wave-tube (TWT) for a solid sheet electron beam. The `hot' dispersion equation is obtained by means of the self-consistent field theory. The small signal analysis, which includes the effects of the beam parameters and slow-wave structure (SWS) parameters, is carried out by theoretical computation. The numerical results show that the bandwidth and the small-signal gain of the rectangular helix TWT increase as the beam current increases; and the beam voltage not obviously influences the small signal gain. Among different rectangular helix structures, the small-signal gain increases as the width of the rectangular helix SWS increases, however, the bandwidth decreases whether structure parameters a and L or ψ and L are fixed or not. In addition, a comparison of the small-signal gain of this structure with a conventional round helix is made. The presented analysis will be useful for the design of the TWT with a rectangular helix circuit.

Abstract: This paper investigates the properties of traveling wave-beam interaction in a rectangular helix traveling-wave-tube (TWT) for a solid sheet electron beam. The `hot' dispersion equation is obtained by means of the self-consistent field theory. The small signal analysis, which includes the effects of the beam parameters and slow-wave structure (SWS) parameters, is carried out by theoretical computation. The numerical results show that the bandwidth and the small-signal gain of the rectangular helix TWT increase as the beam current increases; and the beam voltage not obviously influences the small signal gain. Among different rectangular helix structures, the small-signal gain increases as the width of the rectangular helix SWS increases, however, the bandwidth decreases whether structure parameters a and L or $\psi$ and L are fixed or not. In addition, a comparison of the small-signal gain of this structure with a conventional round helix is made. The presented analysis will be useful for the design of the TWT with a rectangular helix circuit.

Key words: rectangular helix, small-signal gain, slow-wave structure, compact TWT

中图分类号:  (Microwave tubes (e.g., klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.))

  • 84.40.Fe
41.75.Fr (Electron and positron beams)