Measurements of energy transport patterns in solid density laser plasma interactions at intensities of 5x1020 W cm-2
Measurements of energy transport patterns in solid density laser plasma interactions at intensities of 5x1020 W cm-2
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DOI：
10.1103/physrevlett.98.125002
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发表时间：
2007-03-23
影响因子：
8.6
通讯作者：
Norreys, P. A.
中科院分区：
文献类型：
--
作者：
Lancaster, K. L.;Green, J. S.;Norreys, P. A.
K-α X射线发射、极紫外发射和等离子体成像技术已被用来诊断强度高达5 × 10 ~（20）Wcm ~（-20）的厚度为5 ~ 75 μ m的铜箔中的能量输运模式。K-α发射和阴影图都表明在较低强度下比文献中报道的发散角更大[R。Stephens，Phys.Rev.E69，066414（2004）]。5 μ m厚的箔在后表面和前表面显示出三峰等离子体膨胀图案。混合代码建模表明，这可以归因于在大半径处发射的快速电子的平均能量的增加，其仅具有足够的能量来在如此薄的目标中形成等离子体。
K-alpha x-ray emission, extreme ultraviolet emission, and plasma imaging techniques have been used to diagnose energy transport patterns in copper foils ranging in thickness from 5 to 75 mu m for intensities up to 5x10(20) Wcm(-20). The K-alpha emission and shadowgrams both indicate a larger divergence angle than that reported in the literature at lower intensities [R. Stephens , Phys. Rev. E 69, 066414 (2004)]. Foils 5 mu m thick show triple-humped plasma expansion patterns at the back and front surfaces. Hybrid code modeling shows that this can be attributed to an increase in the mean energy of the fast electrons emitted at large radii, which only have sufficient energy to form a plasma in such thin targets.