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Shaping of ion energy spectrum due to ionization in ion acceleration driven by an ultra-short pulse laser

机译：由超短脉冲激光驱动的离子能谱引起的离子能谱形状

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In the interaction between an ultra-short laser pulse and an ultra-thin film target, field ionization dominates the plasma formation. The charge and density distribution of the plasma are determined by the laser pulse and the target, and play a crucial role on the following ion acceleration process. In this paper, we study the role of ionization in laser ion acceleration with particle-in-cell simulations. The ion energy spectra in the simulations including ionization are significantly shaped comparing with those from the simulations using a pre-ionized plasma. The shaping of the ion energy spectra is robust in a wide parameter range, in term of laser temporal profile, intensity, duration and target material. This work also shows the possibility to generate quasi-monoenergetic ion beams resulted by ionization. The benchmark simulation well reproduces the narrow bandwidth ion energy spectra, the evolution of the particle number with charge state, and the leaps on the ion energy, those observed in the previous experiments. This study reveals the necessity to include ionization in modeling laser ion acceleration, and provides an approach to understand the shaping of ion energy spectra in the experiments.
机译：在超短激光脉冲和超薄膜目标之间的相互作用中，场电离主要是等离子体形成。等离子体的电荷和密度分布由激光脉冲和目标决定，并在以下离子加速过程中发挥至关重要的作用。在本文中，我们研究了电离在激光离子加速度与粒子内模拟的作用。模拟中的离子能谱包括使用预热等离子体与模拟的仿真相比。离子能谱的成形在广泛的参数范围内是鲁棒的，在激光时间轮廓，强度，持续时间和目标材料的术语中。这项工作还表明可能产生通过电离产生的准单体离子束。基准模拟良好地再现窄带宽离子能谱，粒子数用充电状态的进化，以及离子能量上的跳跃，在先前的实验中观察到的。该研究揭示了在模拟激光离子加速下包括电离的必要性，并提供了理解实验中离子能谱的成形的方法。

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