Investigation on the optimal magnetic field of a cusp electron gun for a W-band gyro-TWA
Investigation on the optimal magnetic field of a cusp electron gun for a W-band gyro-TWA
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DOI：
10.1063/1.5027070
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发表时间：
2018-05
影响因子：
2.2
通讯作者：
Liang Zhang;Wenlong He;C. Donaldson;A. Cross
中科院分区：
文献类型：
--
作者：
Liang Zhang;Wenlong He;C. Donaldson;A. Cross
回旋行波管放大器（gyro-TWA）的高效率和宽带工作要求具有低速扩展的高质量电子束。束流速度的扩展主要是由于电子所承受的电场和磁场的差异。本文探讨了解耦的电子枪的几何形状和磁铁系统的设计，同时仍然达到最佳的结果，通过一个案例研究的设计一个会切电子枪的W波段陀螺TWA。采用全局多目标优化布线方法，针对不同的磁场分布，分别对电子枪的几何结构进行优化。对它们的结果进行了比较，并总结了所需磁场分布的特性。
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.