Suppression of Secondary Electron Yield Effect in the 650MHz/800kW Klystron for CEPC

Xiang He, Cai Meng, Shilun Pei, Jianli Wang, Ouzheng Xiao, Ningchuang Zhou, Boland, Mark (Ed.), Tanaka, Hitoshi (Ed.), Button, David (Ed.), Dowd, Rohan (Ed.), Schaa, Volker RW (Ed.), Tan, Eugene (Ed.)
The circular electron positron collider (CEPC) is in pre-research, it will need more than two hundred 650MHz/800kW klystrons. The secondary electron yield (SEY) effect suppression is very important for the klystron working stable. The simulation uses an incident primary electron source and considers all the phases and power levels of the input microwave. Two methods are simulated for the SEY suppression. The groove cutting on the nose of cavities is much simple while the TiN coating can
more » ... better. The effect after groove cutting on nose is also simulated and the corresponding compensations are adopted. For simplify the fabrication progress as well as some experience that can be referenced, the groove cutting method is adopted finally for the first klystron prototype, which is expected to be available in the summer of 2019.
doi:10.18429/jacow-ipac2019-weprb045 fatcat:x4kbaekqfngqxc4w5e6ni7v3km