A laser ion source can provide intense pulsed ion beams from a solid target. On the other hand, generation of a proton beam with a laser ion source requires using compound targets containing hydrogen. In this research, we demonstrated proton generation from three kinds of hydrocarbon polymer targets: polyethylene (C2H4)n, polypropylene (C3H6)n, and polystyrene (C8H8)n. The laser used was a Nd:YAG laser (532 nm/17 ns), and the energy was 0.2 J. The ion current and the fraction of ion species were measured using a Faraday cup and an electrostatic ion analyzer. The results indicated that the peak currents and fraction to total particle number of proton were similar for the different hydrocarbon polymer targets and also showed that increasing the laser intensity effectively increases the number of proton particles because the larger the laser intensity, the larger the total charge.

中文翻译：

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用于激光离子源的烃类聚合物靶产生质子

激光离子源可以提供来自固体目标的强脉冲离子束。另一方面，使用激光离子源产生质子束需要使用含氢的复合靶。在这项研究中，我们展示了三种碳氢聚合物靶标的质子生成：聚乙烯 (C2H4)n、聚丙烯 (C3H6)n 和聚苯乙烯 (C8H8)n。使用的激光是 Nd:YAG 激光 (532 nm/17 ns)，能量为 0.2 J。使用法拉第杯和静电离子分析仪测量离子电流和离子种类的分数。