Target normal sheath acceleration of foil ions by laser-trapped hot electrons from a long subcritical-density preplasma
Target normal sheath acceleration of foil ions by laser-trapped hot electrons from a long subcritical-density preplasma
复制标题
通过来自长亚临界密度前等离子体的激光捕获热电子来实现箔离子的目标法向鞘加速
DOI：
10.1063/1.4903878
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发表时间：
2014
影响因子：
2.2
通讯作者：
Xu Z. Z.
中科院分区：
文献类型：
--
作者：
Luan S. X.;Yu Wei;Yu M. Y.;Zhuo H. B.;Xu Han;Wong A. Y.;Wang J. W.;Shen B. F.;Xu Z. Z.
在长的亚临界密度等离子体中，超短超强激光脉冲可以自组织成由调制激光和大量来自等离子体的俘获电子组成的快速但亚相对论的传输结构。在撞击具有放置在该结构中的固体箔靶的结构时，剩余的激光被反射，但是密集且热的被捕获的电子与撞击产生的靶前表面电子一起穿过箔，以在靶的背面形成密集的热电子云，该密集的热电子云适于增强靶后表面离子的靶法向鞘层加速。加速的离子是很好的准直和高的电荷和能量密度，峰值能量的一个完整的数量级高于从目标正常鞘加速没有亚临界密度等离子体。在后一种情况下，加速离子的空间电荷场是有限的，因为它们只形成由目标前表面的电子在激光反射的非常短的瞬间。
In a long subcritical density plasma, an ultrashort ultraintense laser pulse can self-organize into a fast but sub-relativistic propagating structure consisting of the modulated laser light and a large number of trapped electrons from the plasma. Upon impact of the structure with a solid foil target placed in the latter, the remaining laser light is reflected, but the dense and hot trapped electrons pass through the foil, together with the impact-generated target-frontsurface electrons to form a dense hot electron cloud at the back of the target suitable for enhancing target normal sheath acceleration of the target-backsurface ions. The accelerated ions are well collimated and of high charge and energy densities, with peak energies a full order of magnitude higher than that from target normal sheath acceleration without the subcritical density plasma. In the latter case, the space-charge field accelerating the ions is limited since they are formed only by the target-frontsurface electrons during the very short instant of laser reflection.