The effect of increasing strength of the electric field of separated charge due to the capture of laser-accelerated fast electrons in a thin solid target is theoretically substantiated. The target considered is so thin that a fast electron passes through the target during the time less than at least half of the applied laser pulse with the additional requirement that energy loss of a fast electron in the balk target is negligible compared to the energy transfer to ions accelerated in a sheath field. An analytical model is proposed of sheath field formation when fast electrons oscillate due to their reflections in the double layers at both boundaries of a thin target. It is shown that the increasing density of fast electrons inside the double layer and shortening of this layer are the reasons of sheath field strength amplification in a thin target in comparison with a thick target. The increase in the number and the energy of fast ions due to field amplification in a thin target is discussed.

中文翻译：

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由于捕获在薄目标附近振荡的激光产生的快速电子而放大分离的电荷场

由于在薄固体靶中捕获激光加速的快电子，分离电荷的电场强度增加的效果在理论上得到证实。所考虑的目标是如此之薄，以至于快电子在少于所施加激光脉冲的至少一半的时间内穿过目标，并附加要求与能量转移相比，快速电子在阻挡目标中的能量损失可以忽略不计。离子在鞘场中加速。当快速电子由于它们在薄目标的两个边界的双层中的反射而振荡时，提出了鞘场形成的分析模型。结果表明，与厚靶相比，双电层内部快电子密度的增加和该层的缩短是薄靶中鞘层场强放大的原因。讨论了由于薄靶中的场放大引起的快离子数量和能量的增加。