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

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.