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首页> 外文期刊>Plasma physics and controlled fusion >Modelling the effect of laser focal spot size on sheath- accelerated protons in intense laser–foil interactions
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Modelling the effect of laser focal spot size on sheath- accelerated protons in intense laser–foil interactions

机译：在激烈的激光-箔相互作用中模拟激光焦点尺寸对鞘层加速质子的影响

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摘要

We present an approach to modelling the effect of the laser focal spot size on the acceleration of protons from ultra-thin foil targets irradiated by ultra-short laser pulses of intensity 10~(16)–10~(18)Wcm~(?2). An expression is introduced for the proton acceleration time, which takes account of the time taken for the laser-accelerated electrons, which expand laterally at the rear surface of the target, to escape the region of the sheath. When incorporated into an analytical model of plasma expansion, this approach is found to provide a good fit to measured scaling of the maximum proton energy as a function of intensity at large focal spot sizes.
机译：我们提出一种方法来模拟激光焦斑大小对强度为10〜（16）–10〜（18）Wcm〜（？2）的超短激光脉冲辐照的超薄箔靶质子加速的影响。 ）。引入了质子加速时间的表达式，该表达式考虑了在靶的后表面横向扩展的激光加速电子逃逸护套区域所需的时间。当结合到等离子体膨胀的分析模型中时，发现该方法非常适合于测量最大质子能量随大小变化在最大焦点尺寸时的缩放比例。

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