直线感应加速器用光阴极实验研究
Experimental research on photocathode for linear induction accelerator
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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‰.
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Key words:
- linear induction accelerator /
- photocathode /
- solid laser /
- dispenser cathode /
- plasma
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