用于DC-SC超导光电子枪中的光阴极的研制  

Research and Fabrication of the Photocathodes for DC-SC Photoinjector

作　　者：向蓉[1] 全胜文[1] 林林[1] 丁原涛[1] 鲁向阳[1] 焦飞[1] 王桂梅[1] 赵夔[1] 

机构地区：[1]北京大学重离子物理研究所射频超导加速器实验室,北京100871

出　　处：《高能物理与核物理》2004年第7期771-774,共4页High Energy Physics and Nuclear Physics

基　　金：973计划 ( 2 0 0 2CB713 60 0 );国家自然科学基金 ( 10 0 75 0 0 6) ( 19985 0 0 1)资助~~

摘　　要：DC SC超导光阴极微波电子枪是一种新型的高平均流强电子源 ,本文介绍了其中的关键部件———光阴极的研制 .在自行研制的光阴极制备室里成功制备了两种光阴极 :Cs2 Te和Cs3 Sb光阴极 .Cs2 Te光阴极的寿命长 ,用 2 6 6nm紫外光激发 ,量子效率QE >2 5 % ,真空中 (1× 10 -5Pa)寿命5 0h .Cs3 Sb光阴极是多层膜结构 ,用 5 32nm激光激发 ,量子效率 2 % ,真空中 (10 -5Pa)寿命只有几个小时 .两者都可以满足电子枪的设计要求 ,但是由于Cs2 Te光阴极更稳定 ,在目前的DCDC-SC photoinjector is a new injector based on the laser-driven photocathode. It is designed to produce the electron beam with high average current required by high average power FEL experiments. For this projector, Cs 2Te and Cs 3Sb photocathodes are fabricated in a self-designed preparation chamber, which is bakable and the vacuum can reach values of 10 -6 Pa. Cs 2Te is excited by 266nm UV laser, and its quantum efficiency(QE) is above 2 5% for more than 50 hours, and the QE of Cs 3Sb at 532nm is about 2% and stable for only several hours in vacuum. They can provide enough electrons for our electron gun. Because of its stability, Cs 2 Te is adopted in the test facility of the DC-SC photoinjector.

关 键 词：量子效率 超导光电子枪 光阴极 超导加速器装置 碲化铯 锑化铯 高能物理学 

分 类 号：O462[理学—电子物理学]