Axis-encircling electron beam generation using a smooth magnetic cusp for gyrodevices

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The generation of an annular-shaped axis-encircling electron beam using a smooth magnetic cusp was studied through numerical simulations and experiments for harmonic operation of a gyrodevice. Two magnetic coils were used to form a magnetic cusp located just downstream from the velvet cathode of an accelerator diode. An electron beam of current 34 A and voltage 130 kV with an adjustable velocity ratio α up to 1.2 was fully transported to the downstream uniform magnetic field region and used to drive a gyrotron traveling wave amplifier into saturation. (Abstract copied from:
Original languageEnglish
JournalApplied Physics Letters
Issue number12
Publication statusPublished - 22 Sep 2008


  • axis-encircling
  • electron beam
  • generation
  • smooth magnetic cusp
  • gyrodevices


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