强激光与粒子束, 2010, 22 (3): 583, 网络出版: 2010-05-28  

直线感应加速器用光阴极实验研究

Experimental research on photocathode for linear induction accelerator
作者单位
中国工程物理研究院 流体物理研究所,四川 绵阳 621900
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‰。
Abstract
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 synchronization 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/cm2,the maximal emission current density was about 16 A/cm2,and the quantum efficiency of photoemission was about 0.05‰.

张篁, 陈德彪, 江孝国, 夏连胜, 刘星光, 谌怡, 章林文. 直线感应加速器用光阴极实验研究[J]. 强激光与粒子束, 2010, 22(3): 583. Zhang Huang, Chen Debiao, Jiang Xiaoguo, Xia Liansheng, Liu Xingguang, Chen Yi, Zhang Linwen. Experimental research on photocathode for linear induction accelerator[J]. High Power Laser and Particle Beams, 2010, 22(3): 583.

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