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2009 Volume 18 Issue 7
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Fu Cheng-Fang, Wei Yan-Yu, Duan Zhao-Yun, Wang Wen-Xiang, Gong Yu-Bin. 2009: Small-signal analysis of a rectangular helix structure traveling-wave-tube, Chinese Physics B, 18(7): 2749-2756.
Citation: Fu Cheng-Fang, Wei Yan-Yu, Duan Zhao-Yun, Wang Wen-Xiang, Gong Yu-Bin. 2009: Small-signal analysis of a rectangular helix structure traveling-wave-tube, Chinese Physics B, 18(7): 2749-2756.
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Small-signal analysis of a rectangular helix structure traveling-wave-tube

  • National Key Laboratory of High Power Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China

  • Available Online: 30/07/2009
  • Fund Project: Project supported in part by the National Natural Science Foundation of China(Grant 60532010)%the Talent Fund of Chinese Education Administration
  • 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 smallsignal 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 Lor 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.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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

  • Available Online: 30/07/2009

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 smallsignal 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 Lor 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.

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