Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA.
Department of Mechanical Engineering, University of Rochester, Rochester, New York 14627, USA.
Phys Rev E. 2019 Oct;100(4-1):041201. doi: 10.1103/PhysRevE.100.041201.
The nonlinear regime of laser-plasma interactions including both two-plasmon decay (TPD) and stimulated Raman scattering (SRS) instabilities has been studied in three-dimensional (3D) particle-in-cell simulations with parameters relevant to the inertial confinement fusion (ICF) experiments. SRS and TPD develop in the same region in plasmas, and the generation of fast electrons can be described accurately with only the full model including both SRS and TPD. The growth of instabilities in the linear stage is found to be in good agreement with analytical theories. In the saturation stage the low-frequency density perturbations driven by the daughter waves of the SRS side scattering can saturate the TPD and consequently inhibit the fast-electron generation. The fast-electron flux in 3D modeling is up to an order of magnitude smaller than previously reported in 2D TPD simulations, bringing it close to the results of ICF experiments.
已在与惯性约束聚变（ICF）实验相关的参数下通过三维（3D）粒子模拟对包括双等离子体衰减（TPD）和受激拉曼散射（SRS）不稳定性在内的激光等离子体相互作用的非线性区进行了研究。SRS 和 TPD 在等离子体中同一区域发展，并且仅用包括 SRS 和 TPD 在内的全模型可以准确地描述快电子的产生。线性阶段的不稳定性的增长与分析理论吻合良好。在饱和阶段，由 SRS 侧向散射的子波驱动的低频密度扰动可以使 TPD 饱和，从而抑制快电子的产生。在 3D 建模中，快电子通量比之前在 2D TPD 模拟中报道的要小一个数量级，使其接近 ICF 实验的结果。
