Enhanced ion acceleration in transition from opaque to transparent plasmas
Enhanced ion acceleration in transition from opaque to transparent plasmas
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DOI：
10.1088/1367-2630/aab8db
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发表时间：
2018-04-20
影响因子：
3.3
通讯作者：
Glenzer, S.
中科院分区：
文献类型：
--
作者：
Mishra, R.;Fiuza, F.;Glenzer, S.
采用粒子模拟方法，研究了强激光与等离子体相互作用过程中离子加速的过程。我们发现，最高的离子能量时，激光横穿周围的峰值强度的目标，并重新加热负责等离子体膨胀的电子人口，提高了相应的鞘电场。与相同激光条件下不透明靶中的标准靶正常鞘层加速相比，该过程可导致离子能量增加高达2倍。建立了一个理论模型来预测最佳靶面密度随激光强度和脉冲宽度的变化。一个系统的参数扫描范围广泛的目标密度和厚度在1D，2D和3D中进行，并与理论和最近的实验结果一致。这些结果为今后激光固体实验中离子能量的更好优化开辟了道路。
Using particle-in-cell simulations, we investigate ion acceleration in the interaction of high intensity lasers with plasmas which transition from opaque to transparent during the interaction process. We show that the highest ion energies are achieved when the laser traverses the target around the peak intensity and re-heats the electron population responsible for the plasma expansion, enhancing the corresponding sheath electric field. This process can lead to an increase of up to 2x in ion energy when compared with the standard Target Normal Sheath Acceleration in opaque targets under the same laser conditions. A theoretical model is developed to predict the optimal target areal density as a function of laser intensity and pulse duration. A systematic parametric scan for a wide range of target densities and thicknesses is performed in 1D, 2D and 3D and shown consistent with the theory and with recent experimental results. These results open the way for a better optimization of the ion energy in future laser-solid experiments.