Development of Preparation Systems with K 2 CsSb Photocathodes and Study on the Preparation Process

The next generation of advanced light sources requires photons with large average flux and high brightness,which needs advanced electron gun matched with excellent photocathode materials. K 2 CsSb photocathode has the advantages of high quantum efficiency, long lifetime and instantaneous response. This study introduces the design of a set of K 2 CsSb photocathode preparation systems and detailed preparation process of K 2 CsSb photocathodes, including sequential deposition process and co-deposition process, and finally develops a K 2 CsSb photocathode. The influence of laser power on the quantum efficiency is also investigated.