PRPM聚焦多注速调管电子光学系统的研究

Study on Electron Optics System of Multi-beam Klystron with PRPM Focusing

该文采用边界元(BEM)软件TAU对具有周期反转永磁(PRPM)聚焦结构的多注速调管电子光学系统进行研究。通过编写程序增加TAU读入三维磁场数据的功能,从MAFIA中导入三维磁场,分别模拟了处于径向不同位置处电子注的轨迹。通过对磁聚焦系统进行优化设计,外层电子注轨迹得到明显改善。使用软件TAU进行三维模拟可以大大缩短模拟时间,便于多注速调管电子光学系统的工程设计。

Boundary Element Method（BEM） is applied to simulate electron optics system of multi-beam klystron with PRPM focusing in this paper. The function of importing 3D magnetic fields from MAFIA is added to TAU. Magnetic induction distribution along Z axis at different radial positions is given out and the electron trajectories are analysed. Optimization of the magnetic focusing system can decrease the radial magnetic induction and improve the electron beam quality. Less time will be needed than other codes, TAU become a very useful tool for multi-beam electron gun design.