激光驱动的光阴极研究
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摘要: 论述激光驱动的光阴极实验研究。包括直流高压真空试验系统,测试装置和实验结果及其分析讨论。LaB6、纯金属铜(Cu）和钐（Sm）以及半导体碲化铯(Cs2Te）三类有代表性光阴极的量子效率分别是6×10-4、3.8×10-4、11.6×10-4和(2~6)×10-4。利用KrF激光,18kV极间电压下饱和电流密度分别为70A/cm2、50 A/cm2、102A/cm2和57A/cm2。用多孔板法测得的归一化发射度约10pmm· mrad,相应的归一化亮度约1010A/m2· rad2。Abstract: The experimental studies of photocathode driven by a laser are reported in this paper. The experimental systems including the D-C voltage vacuum chamber and measurement apparatus are given. Also we will present the experimental results and discussions of LaB6, pure metals (Cu,Sm) and Cs2Te semiconductor photocathode. The quantum efficiencies of photocathodes are 6 10- 4、3.8 10- 4、11.6 10- 4 and (2~6) 10- 2, respectively, the corresponding photocurrent densities of 70A/cm2、50 A/cm2、102A/cm2 and 57A/cm2 are obtained. Using the pepper pot method, the normalized beam emittances for these materials are about 10p mm· mrad and the corresponding normalized brightnesses are about 1010A/m2× rad2.
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Key words:
- photocathode /
- quantum efficiency /
- beam emittance /
- beam brightness. /
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