Design and numerical optimization of a cusp-gun-based electron beam for millimeter-wave gyro-devices

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A novel thermionic cusp electron gun operating in the temperature-limited regime that produces a large-orbit electron beam through a nonadiabatic magnetic-field reversal was designed, analyzed, and optimized to give an electron-beam ideal for driving gyro-devices, particularly in the millimeter-to-submillimeter-wavelength range due to its small cross-sectional size. The annular-shaped axis-encircling electron beam had a beam current of 1.5 A at an acceleration potential of 40 kV, a tunable velocity ratio alpha (= vperp/vz) between one and three, an optimized axial velocity spread A.vx/vz of ~8%, and a relative alpha spread Deltakappa/alpha of ~10% at an alpha value of 1.65.
Original languageEnglish
Pages (from-to)2153-2157
Number of pages4
JournalIEEE Transactions on Plasma Science
Issue number11
Publication statusPublished - 6 Nov 2009


  • axis-encircling electron beam
  • cusp electron gun
  • gyro-BWO
  • gyro-TWT
  • high-harmonic gyrotron
  • THz electron-beam source
  • W-band

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