Numerical modeling of fast electron transport in short pulse laser–solid interactions with long scale-length pre-formed plasma
Numerical modeling of fast electron transport in short pulse laser–solid interactions with long scale-length pre-formed plasma
复制标题
短脉冲激光-固体与长尺度预形成等离子体相互作用中快速电子传输的数值模拟
DOI：
10.1088/0741-3335/52/12/125003
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发表时间：
2010
影响因子：
2.2
通讯作者：
F. Beg
中科院分区：
文献类型：
--
作者：
B. Paradkar;M. Wei;T. Yabuuchi;R. Stephens;J. Larsen;F. Beg
数值模拟的实验结果进行了调查长尺度预等离子体对快电子输运的影响。在短脉冲激光（强度约为3 × 1018 W cm−2）与长尺度预等离子体相互作用时，实验观察到Cu Kα x射线辐射中的一种特殊的环状结构。用辐射流体动力学程序h2d模拟了长脉冲激光照射在铝层间夹有铜荧光层的平面靶上产生的长尺度预等离子体。快速电子输运模型进行的混合粒子在细胞的代码，LSP，表明环结构是由于低能量（150 keV）的快速电子在预形成的等离子体中返回到固体目标的能量。模拟结果表明，在横向等离子体边界附近的强静电场的激发是负责这一点。详细的建模沿着与环状Kα x射线发射的确切机制进行了讨论。
Results of numerical modeling of the experiment carried out to investigate the effect of long scale pre-plasma on fast electron transport are presented. A peculiar ring-like structure in Cu Kα x-ray emission was seen experimentally when a short pulse laser (intensity ∼3 × 1018 W cm−2) interacted with a long scale pre-plasma. The long scale pre-plasma, produced by irradiation of a long pulse laser on a flat target having copper fluorescence layer sandwiched between aluminum layers, is modeled with the radiation hydrodynamic code, h2d. Fast electron transport modeling performed with the hybrid particle-in-cell code, LSP, suggests that the ring structure is due to the refluxing of low energy (∼50 keV) fast electrons traveling in the pre-formed plasma back to the solid target. Modeling shows that the excitation of strong electrostatic fields near the transverse plasma boundary is responsible for this refluxing. Details of the modeling along with the exact mechanism of formation of ring-like Kα x-ray emission are discussed.
影响因子：
64.8
作者：
Kodama, R;Norreys, PA;Zepf, M
通讯作者：
Zepf, M