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Linear theory of the beam-wave interaction in a ridge-loaded folded slow-wave structure

He Jun Wei Yan-Yu Gong Yu-Bin Duan Zhao-Yun Lu Zhi-Gang Wang Wen-Xiang

Linear theory of the beam-wave interaction in a ridge-loaded folded slow-wave structure

He Jun, Wei Yan-Yu, Gong Yu-Bin, Duan Zhao-Yun, Lu Zhi-Gang, Wang Wen-Xiang
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  • Abstract views:  3038
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  • Received Date:  04 January 2010
  • Accepted Date:  19 January 2010
  • Published Online:  15 September 2010

Linear theory of the beam-wave interaction in a ridge-loaded folded slow-wave structure

  • 1. Vacuum Electronics National Laboratory, School of Physical Electronics, University of Electronic Science and Technology of China,Chengdu 610054, China

Abstract: A novel mm-wave high power microwave device, the ridge-loaded folded waveguide traveling wave tube (TWT), is presented and its linear gain properties are investigated. The perturbed dispersion equation is derived and the small signal growth rate is calculated for different dimensions of ridge and parameters of electron beam. For a cold beam, the linear theory predicts a gain of 1.15 dB/period and a 3-dB small-signal gain bandwidth of 18.51% in Kα-band. The investigation reveals that, with the same beam parameters, the novel slow-wave structure (SWS) has advantage over the folded waveguide SWS in its gain and efficiency. The dimensions of ridge and the beam current may be increased in order to raise the gain.

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