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.
Received: 18 October 2008
Revised: 10 November 2008
Accepted manuscript online:
Fund: Project supported in part by the
National Natural Science Foundation of China (Grant No 60532010) and
the Talent Fund of Chinese Education Administration.
Cite this article:
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) Small-signal analysis of a rectangular helix structure traveling-wave-tube 2009 Chin. Phys. B 18 2749
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