Helically corrugated interaction regions for W-band gyrotron-Traveling Wave Amplifiers

Research output: Chapter in Book/Report/Conference proceedingConference contribution book


The helically corrugated interaction region (HCIR) is able to produce an almost ideal dispersion for microwave oscillators/amplifiers. The HCIR is studied and presented in this paper with particular application in a W-band broadband, kW-level gyrotron traveling wave amplifier (gyro-TWA). The dispersion of the waveguide was calculated, and measurements of a manufactured HCIR showed good agreement with predictions. Numerical simulations of the beam-wave interaction in different circuits showed stable output can be achieved in two gain regions separated by a sever (with purposeful reflections at each end of the circuit). The demonstration of a gyro-TWA based on the HCIR is described with a 3-dB bandwidth of over 5.5 GHz with more than 3.4 kW and the gain was around 36–38 dB. The work presented in this paper will widen the capability of the gyro-TWA from single pulse to high PRF operation.
Original languageEnglish
Title of host publication2023 53rd European Microwave Conference (EuMC)
ISBN (Electronic)978-2-87487-072-9
ISBN (Print)979-8-3503-4739-5
Publication statusPublished - 19 Sept 2023
Event2023 53rd European Microwave Conference (EuMC) - Berlin, Germany
Duration: 19 Sept 202321 Sept 2023

Publication series

Name2023 53rd European Microwave Conference (EuMC)
PublisherIEEE DataPort


Conference2023 53rd European Microwave Conference (EuMC)


  • gyrotron traveling wave amplifier
  • frequency-swept
  • helically corrugated waveguide
  • broadband amplification


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