W-band Gyro-BWO using a helically corrugated waveguide

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


Presented in this paper is the design of a W-Band Gyro-BWO with a helically corrugated waveguide and a cusp electron gun. The interaction region has been constructed with good accuracy and microwave results measured using a vector network analyzer are given. The microwave dispersion agrees well with analytical and numerical theory. The transmission loss of this helically corrugated waveguide was measured to be ~1dB over the frequency range (84 - 104GHz). A cusp electron gun has been designed to generate a 1.5A, 40kV electron beam with an adjustable pitch angle (α) of up to 3. The beam was optimized through numerical simulation with an axial velocity spread, ΔV z /V z , of 7% and Δα/α, of 10.4% at α=1.65. From simulation of the beam-wave interaction the maximum output power from the Gyro-BWO was predicted to be 10kW (CW) at 17% efficiency, with a 3dB frequency tuning range of ~84-104GHz.
Original languageEnglish
Title of host publication2008 17th International Conference on High Power Particle Beams (BEAMS)
Place of PublicationPiscataway, NJ
Publication statusPublished - 21 May 2012


  • design automation
  • current measurement
  • heating
  • coils
  • cathodes
  • numerical simulation


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