Investigation on the optimal magnetic field of a cusp electron gun for a W-band gyro-TWA

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Abstract

High efficiency and broadband operation of a gyrotron traveling wave amplifier (gyro-TWA) requires a high-quality electron beam with low-velocity spreads. The beam velocity spreads are mainly due to the differences of the electric and magnetic fields that the electrons withstand the electron gun. This paper investigates the possibility to decouple the design of electron gun geometry and the magnet system while still achieving optimal results, through a case study of designing a cusp electron gun for a W-band gyro-TWA. A global multiple-objective optimization routing was used to optimize the electron gun geometry for different predefined magnetic field profiles individually. Their results were compared and the properties of the required magnetic field profile are summarized.
Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalPhysics of Plasmas
Early online date9 May 2018
DOIs
Publication statusE-pub ahead of print - 9 May 2018

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Keywords

  • gyro-amplifier
  • cusp electron gun
  • magnetic field

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