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Comparative analysis on TM110-2π-mode and TM110-π-mode as the operating mode for W-band sheet beam klystron

Author

Listed:
  • Guo Liu
  • Jianxun Wang
  • Yong Luo

Abstract

Multicavity multigap sheet beam klystron in W-band is an ideally portable coherent radiation source for nonlethal warfare system. In general, the beam–wave interaction circuit employs multigap structures operating with TM110-2π-mode. In this paper, compared investigation of TM110-2π-mode and TM110-π-mode interacting with sheet beam is demonstrated. Analysis indicates that although TM110-2π-mode has higher cavity impendence R/Q, TM110-π-mode possesses wider frequency spacing interval with the adjacent competition modes, larger beam–wave coupling coefficient M and M2(R/Q), which is profitable to improve beam–wave interaction efficiency, reduce mode oscillation and shorten the circuit length. Furthermore, cold characteristics, including R/Q, M, M2(R/Q), operating frequency, and electric-field uniformity, with different gap distance and variable displacements along electron beam propagation and the perpendicular direction are explained in detail. It also turns out TM110-π-mode is not sensitive to the fluctuations of cold characteristics as TM110-2π-mode. This paper provides a confident evidence for TM110-π-mode interacting with sheet beam in the WSBK design.

Suggested Citation

  • Guo Liu & Jianxun Wang & Yong Luo, 2013. "Comparative analysis on TM110-2π-mode and TM110-π-mode as the operating mode for W-band sheet beam klystron," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 27(9), pages 1089-1099, June.
    • Handle: RePEc:taf:tewaxx:v:27:y:2013:i:9:p:1089-1099
    DOI: 10.1080/09205071.2013.800462
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