用于DC-SC光阴极微波电子枪中的Cs_2Te光阴极研制

Research and Fabrication of the Photocathode Used in DC-SC Photocathode RF Electron Gun

文章介绍DC SC光阴极微波电子枪中的关键部件———Cs2 Te光阴极的研制。采用两种方法制得了高量子效率要求的Cs2 Te光阴极 ,并实验比较了两种制备方法的效果。针对制备中的超高真空、精确控制Cs原子流量和阴极温度等关键问题 ,设计了用于DC SC光阴极微波电子枪中的光阴极制备室。

DC-SC photocathode RF electron gun is the new injector based on the laser-driven superconducting RF gun. It has been designed and is on the way of operation at Peking University, in order to produce the beam with high average current required by SASE FEL experiments. High quantum efficiency cesium telluride photocathodes are fabricated in two methods, and the results are compared and analyzed. To resolve the key problems in the preparing process, such as the super high vacuum, the accurate controlling of Cs flux, the temperature of cathode, a new photocathode preparation chamber has been designed for the DC-SC electron gun.