A cusp electron gun for millimeter wave gyrodevices

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The experimental results of a thermionic cusp electron gun, to drive millimeter and submillimeter wave harmonic gyrodevices, are reported in this paper. Using a "smooth" magnetic field reversal formed by two coils this gun generated an annular-shaped, axis-encircling electron beam with 1.5 A current, and an adjustable velocity ratio alpha of up to 1.56 at a beam voltage of 40 kV. The beam cross-sectional shape and transported beam current were measured by a witness plate technique and Faraday cup, respectively. These measured results were found to be in excellent agreement with the simulated results using the three-dimensional code MAGIC.
Original languageEnglish
Article number141501
Number of pages3
JournalApplied Physics Letters
Issue number14
Publication statusPublished - 5 Apr 2010


  • electron guns
  • gyrotrons
  • millimetre wave devices
  • submillimetre wave devices


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