High-gain wide-band gyrotron traveling wave amplifier with a helically corrugated waveguide

V L Bratman, A W Cross, G G Denisov, W He, A D R Phelps, K Ronald, S V Samsonov, C G Whyte, A R Young

Research output: Contribution to journalArticlepeer-review

196 Citations (Scopus)


First bandwidth measurements of a novel gyrotron amplifier are presented. The coupling between the second harmonic cyclotron mode of a gyrating electron beam and the radiation field occurred in the region of near infinite phase velocity over a broad bandwidth by using a cylindrical waveguide with a helical corrugation on its internal surface. With a beam energy of 185 keV, the amplifier achieved a a maximum output power of 1.1 MW, saturated gain of 37 dB, linear gain of 37 dB, saturated bandwidth of 8.4 to 10.4 GHz (21% relative bandwidth), and an efficiency of 29%, in good agreement with theory.

Original languageEnglish
Pages (from-to)2746-2749
Number of pages4
JournalPhysical Review Letters
Issue number12
Publication statusPublished - 20 Mar 2000


  • electron cyclotron maser
  • tube amplifier
  • twt amplifier
  • microwave amplifier
  • microwave devices
  • microwave generation
  • gyro-devices
  • gyro-TWA
  • gyro-travelling wave amplifier


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