关键词: 
激光离子源 /
双脉冲 /
高电荷态离子

摘要: 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 double-pulse laser irradiating scheme has been designed and established for the production of highly charged ion beams at Institute of Modern Physics (IMP), Chinese Academy of Sciences. The laser beam output by a Nd:YAG laser is split and combined by a double of beam splitters, between which the split laser beams are transmitted along different optical paths to get certain time delay between each other. With the help of a quarter-wave plate before the first splitter, the energy ratio between the two laser pulses can be adjusted between 3:8 to 8:3. To testify its feasibility, a preliminary experiment was carried out with the new-developed double-pulse irradiating scheme to produce highly charged carbon ions. Comparing the results with those got from the previous single-pulse irradiating scheme, the differences in the time structure and Charge State Distribution (CSD) of the ion pulse were observed, but its mechanisms and optimization require further studies.