Electro-optical system in high peak power multi-beam klystron
Problems in the electro-optical system in high peak power multi-beam klystrons are analyzed.The electro-optical system of an S-band 50 MW klystron is designed by using an indirect method.Respective shield barrels are used to generate side-symmetrical magnetic field in the cathode-anode area.With the combination of 2D electron-optical code EGUN,3D electromagnetic code MAFIA and 3D PIC(particle-in-cell) code,the electro-optical system is modeled in detail.The result shows that the shield barrels could generate side-symmetrical magnetic field,and that the track of electrons is perfect.