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

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6 Citations (Scopus)

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.
LanguageEnglish
Pages1-6
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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traveling wave amplifiers
electron guns
cusps
magnetic fields
profiles
geometry
low speed
magnets
electron beams
broadband
optimization
electric fields
electrons

Keywords

  • gyro-amplifier
  • cusp electron gun
  • magnetic field

Cite this

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title = "Investigation on the optimal magnetic field of a cusp electron gun for a W-band gyro-TWA",
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.",
keywords = "gyro-amplifier, cusp electron gun, magnetic field",
author = "Liang Zhang and Wenlong He and Donaldson, {Craig R.} and Cross, {Adrian W.}",
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AU - Zhang, Liang

AU - He, Wenlong

AU - Donaldson, Craig R.

AU - Cross, Adrian W.

PY - 2018/5/9

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N2 - 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.

AB - 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.

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