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设计并实现了近代物理研究所激光离子源双脉冲打靶方案以产生高电荷态离子束。从Nd:YAG激光器输出的激光束经过一对分光棱镜的分束-合束,通过改变两束光的光程差,得到有一定时间延迟的双激光脉冲。利用四分之一玻片,双脉冲的能量比值可以在3:8～8:3之间连续调节。为了验证该方案的可行性,对C靶进行了初步实验。实验结果发现,与以往单脉冲打靶方案对比,双脉冲方案在离子束的脉冲时间结构和电荷态分布有所不同。但是,导致这些差异的机理和实验的优化还尚需要进一步研究。
A dual-pulse laser targeting program was designed and implemented in the Institute of Modern Physics to generate highly charged ion beams. The laser beam output from the Nd: YAG laser passes through a splitter-combiner of a pair of dichroic prisms, and a double laser pulse with a certain time delay is obtained by changing the optical path difference between the two beams. With a quarter slide, the double pulse energy ratio can be continuously adjusted between 3: 8 and 8: 3. In order to verify the feasibility of this scheme, a preliminary experiment on C target was carried out. Experimental results show that, compared with the conventional single-pulse target scheme, the pulse duration and the distribution of charge states in the double-pulse scheme are different. However, the mechanisms leading to these differences and the optimization of experiments still need further study.