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在短脉冲激光与团簇气体靶相互作用中，多兆电子伏离子加速的能量增加。

Energy increase in multi-MeV ion acceleration in the interaction of a short pulse laser with a cluster-gas target.

机构信息

Kansai Photon Science Institute and Photo-Medical Research Center, JAEA, Kyoto, 615-0215 Japan.

出版信息

Phys Rev Lett. 2009 Oct 16;103(16):165002. doi: 10.1103/PhysRevLett.103.165002. Epub 2009 Oct 13.

DOI:10.1103/PhysRevLett.103.165002
PMID:19905702
Abstract

An approach for accelerating ions, with the use of a cluster-gas target and an ultrashort pulse laser of 150-mJ energy and 40-fs duration, is presented. Ions with energy 10-20 MeV per nucleon having a small divergence (full angle) of 3.4 degrees are generated in the forward direction, corresponding to approximately tenfold increase in the ion energies compared to previous experiments using solid targets. It is inferred from a particle-in-cell simulation that the high energy ions are generated at the rear side of the target due to the formation of a strong dipole vortex structure in subcritical density plasmas.

摘要

本文提出了一种利用团簇气体靶和 150mJ 能量、40fs 脉宽的超短脉冲激光加速离子的方法。在正向方向产生了能量为 10-20MeV/核子、全发散角（半顶角）为 3.4 度的小发散角的离子，与以前使用固体靶的实验相比，离子能量提高了约十倍。通过粒子模拟，在亚临界密度等离子体中形成强偶极涡旋结构，推断出高能离子是在靶的后侧面产生的。

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