Design, simulation and experiment of a cusp electron beam for millimeter wave gyro-devices

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The design, simulation and experiment of a thermionic cusp electron gun that is to be used for millimeter wave generation will be presented. A cusp gun uses a non-adiabatic magnetic field reversal to obtain azimuthal motion on an electron beam resulting in an annular shaped, axis-encircling beam. The cusp gun was designed to generate a beam of 1.5A at 40kV with an adjustable velocity ratio of up to 3.0. The beam had a simulated axial velocity spread of 7.4% and alpha spread of 10.1%. The beam had an averaged radius of 0.35mm and beam thickness of 0.05mm which is ideal to drive sub-mm wave gyro-devices under investigation.
Original languageEnglish
Number of pages3
Publication statusPublished - 2009
EventIEEE International Vacuum Electronics Conference, 2008 - Monterey, CA
Duration: 22 Apr 200824 Apr 2008


ConferenceIEEE International Vacuum Electronics Conference, 2008
CityMonterey, CA


  • cusp electron beam
  • gyro-devices
  • vacuum electronics

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