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

W. He, C.G. Whyte, E.G. Rafferty, A.W. Cross, A.D.R. Phelps, K. Ronald, A.R. Young, C.W. Robertson

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86 Citations (Scopus)


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 Sept 2008


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


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