直线感应加速器用光阴极实验研究  

Experimental research on photocathode for linear induction accelerator

作　　者：张篁[1] 陈德彪[1] 江孝国[1] 夏连胜[1] 刘星光[1] 谌怡[1] 章林文[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《强激光与粒子束》2010年第3期583-586,共4页High Power Laser and Particle Beams

基　　金：国防科技基础研究基金项目

摘　　要：通过适当地改造2 MeV注入器实验平台,使系统具备了开展光阴极研究的能力,主要的改动有:将观察窗材料改为石英,增加266 nm固体激光器,对原有的时序控制方式进行修改以满足同步触发方面的要求。研究的阴极材料为含钪储备式热阴极,实验中最高加热到了740℃,观测到了光电发射和光致等离子体发射现象,最大的激光功率密度为1.3 MW/cm2,最大发射电流密度约为16 A/cm2,光电发射的量子效率约为0.05‰。A modified 2 MeV injector was used to study the photocathode for linear induction accelerators, which adopted a frequency-quadrupled Nd：YAG laser （266 nm） and a quartz window. Its trigger system was improved to realize output synehronization between the pulsed power system and the laser. A scandate cathode was investigated and the maximal cathode temperature was about 740℃ in the experiments. Photoemission and plasma emission caused by laser were observed. The maximal laser power density was about 1.3 MW/cm^2 , the maximal emission current density was about 16 A/cm^2 , and the quantum efficiency of photoemission was about 0.05‰.

关 键 词：直线感应加速器 光阴极 固体激光器 储备式热阴极 等离子体 

分 类 号：TL503.3[核科学技术—核技术及应用] O462.3[理学—电子物理学]