Intermittent laser-plasma interactions and hot electron generation in shock ignition
Intermittent laser-plasma interactions and hot electron generation in shock ignition
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DOI：
10.1063/1.4882682
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发表时间：
2013-11
影响因子：
2.2
通讯作者：
R. Yan;J. Li;C. Ren
中科院分区：
文献类型：
--
作者：
R. Yan;J. Li;C. Ren
在长密度标尺和中等强度激光条件下，通过一维和二维粒子单元模拟研究了激波点火点火阶段激光与等离子体的相互作用和热电子的产生。这些长期模拟显示了激光-等离子体不稳定性的间歇性爆发模式，这是由于四分之一临界面附近的模式与低密度区的模式通过等离子体波和激光泵浦耗尽耦合而产生的。发现大部分热电子来自受激拉曼散射，能量中等。然而，具有预热威胁的高能电子仍然可以从双等离子体衰变不稳定性中产生。
We study laser-plasma interactions and hot electron generation in the ignition phase of shock ignition through 1D and 2D particle-in-cell simulations in the regime of long density scale length and moderately high laser intensity. These long-term simulations show an intermittent bursting pattern of laser-plasma instabilities, resulting from a coupling of the modes near the quarter-critical-surface and those in the lower density region via plasma waves and laser pump depletion. The majority of the hot electrons are found to be from stimulated Raman scattering and of moderate energies. However, high energy electrons of preheating threat can still be generated from the two-plasmon-decay instability.