Simulations and measurements of hot-electron generation driven by the multibeam two-plasmon-decay instability
Simulations and measurements of hot-electron generation driven by the multibeam two-plasmon-decay instability
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DOI：
10.1063/1.4998934
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发表时间：
2017-10
影响因子：
2.2
通讯作者：
R. Follett;J. Myatt;J. Shaw;D. T. Michel;A. Solodov;D. Edgell;B. Yaakobi;D. Froula
中科院分区：
文献类型：
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作者：
R. Follett;J. Myatt;J. Shaw;D. T. Michel;A. Solodov;D. Edgell;B. Yaakobi;D. Froula
直接驱动惯性约束核聚变的多束实验表明，非线性饱和机制在共波双等离子体衰变（TPD）不稳定性中的重要性。在OMEGA激光器上进行的平面靶实验使用硬X射线测量来研究线性共波增长率对两种驱动光束配置中TPD驱动的热电子产生的影响，并且在重叠的激光强度范围从3.6到15.2 × 1014 W/cm 2。具有较大线性共波增长率的束流配置具有较低的热电子产生的强度阈值，但在高强度下，线性增长率对热电子产生没有显著影响。使用混合代码LPSE（激光等离子体模拟环境）在3-D中对实验进行建模，该混合代码将波求解器与粒子跟踪器相结合以自洽地计算电子速度分布并演化电子朗道阻尼。良好的定量协议之间获得了…
Multibeam experiments relevant to direct-drive inertial confinement fusion show the importance of nonlinear saturation mechanisms in the common-wave two-plasmon-decay (TPD) instability. Planar-target experiments on the OMEGA laser used hard x-ray measurements to study the influence of the linear common-wave growth rate on TPD-driven hot-electron production in two drive-beam configurations and over a range of overlapped laser intensities from 3.6 to 15.2 × 1014 W/cm2. The beam configuration with the larger linear common-wave growth rate had a lower intensity threshold for the onset of hot-electron production, but the linear growth rate made no significant impact on hot-electron production at high intensities. The experiments were modeled in 3-D using a hybrid code LPSE (laser plasma simulation environment) that combines a wave solver with a particle tracker to self-consistently calculate the electron velocity distribution and evolve electron Landau damping. Good quantitative agreement was obtained between ...