Speaker
Tianhuan Luo
(Lawrence Berkeley National Laboratory)
Description
High rep-rate SRF-Linac based XFEL like LCLS-II has a stringent requirement on the limit of the dark current from the injector RF gun. In this talk, we will present our recent work on mitigating the LCLS-II gun dark current by re-designing the photo cathode. New cathode plugs with ~1mm insertion have been designed, manufactured and commissioned at LCLS-II. They successfully reduce the gun dark from ~uA to ~nA level, and can potentially enable further improvement on the beam emittance.
