Speaker
Description
Multi-alkali antimonide-based photocathodes are suitable candidates for the electron sources of next-generation high brightness RF photoinjectors due to their excellent photoemissive properties, especially low thermal emittances, and high sensitivity to visible light. The utilization of these photocathodes is so far successfully demonstrated in low field DC gun-based photoinjectors. However, their performance in a high field RF gun is still challenging due to their sensitivity towards vacuum conditions. Based on the previous R&D development, a batch of three KCsSb photocathodes of different thicknesses have been developed in a new production system at INFN LASA. Afterwards, these photocathodes are successfully tested and characterized for the first time in a normal conducting CW system at the photo injector test facility at DESY in Zeuthen (PITZ). This talk reports an overview of cathode preparation recipe with its test results like QE map evolution, thermal emittance, response time, and cathode lifetime.
