Enhanced Laser-Driven Ion Acceleration in the Relativistic Transparency Regime
Enhanced Laser-Driven Ion Acceleration in the Relativistic Transparency Regime
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DOI：
10.1103/physrevlett.103.045002
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发表时间：
2009-07-24
影响因子：
8.6
通讯作者：
Hegelich, B. M.
中科院分区：
文献类型：
--
作者：
Henig, A.;Kiefer, D.;Hegelich, B. M.
本文报道了用强度近似为7 × 10 ~（19）W/cm ~ 2的强对比度激光脉冲辐照50、30和10 nm厚的类金刚石碳膜，使离子束加速的实验结果。在30 nm的最佳厚度下观察到完全电离的碳原子的前所未有的最大能量185 MeV（15 MeV/u）。增强的加速度归因于自致透明度，导致靶体内经典过密电子群的强烈体积加热。我们的实验结果支持粒子在细胞（PIC）模拟和分析模型。
We report on the acceleration of ion beams from ultrathin diamondlike carbon foils of thickness 50, 30, and 10 nm irradiated by ultrahigh contrast laser pulses at intensities of similar to 7 X 10(19) W/cm(2). An unprecedented maximum energy of 185 MeV (15 MeV/u) for fully ionized carbon atoms is observed at the optimum thickness of 30 nm. The enhanced acceleration is attributed to self-induced transparency, leading to strong volumetric heating of the classically overdense electron population in the bulk of the target. Our experimental results are supported by both particle-in-cell (PIC) simulations and an analytical model.