Optimization of a triode-type cusp electron gun for a W-band gyro-TWA

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A triode-type cusp electron gun was optimized through numerical simulations for a W-band gyrotron traveling wave amplifier. An additional electrode in front of the cathode could switch the electron beam on and off instantly when its electric potential is properly biased. An optimal electron beam of current 1.7 A and velocity ratio (alpha) of 1.12 with an alpha spread of ~10.7% was achieved when the triode gun was operated at 40 kV.
Original languageEnglish
Article number043120
Number of pages6
JournalPhysics of Plasmas
Issue number4
Early online date26 Apr 2018
Publication statusE-pub ahead of print - 26 Apr 2018


  • gyrotron traveling wave amplifier
  • triode-type gun
  • cusp electron gun
  • large orbit electron beam
  • cusp magnetic field


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