非均匀等离子体中受激拉曼侧散射的再散射

IF 4.8 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Matter and Radiation at Extremes Pub Date : 2024-07-30 DOI:10.1063/5.0206740

S. Tan, Q. Wang, Y. Chen, W. B. Yao, C. Z. Xiao, J. F. Myatt

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引用次数: 0

摘要

通过二维（2D）粒子入胞（PIC）模拟，我们首次观测到了受激拉曼侧散射（SRSS）的再散射。我们构建了再散射过程的理论模型，可以预测 mth 阶 SRSS 的发生区域并估计其阈值。在直接驱动惯性约束聚变方案的典型条件下，通过二维 PIC 模拟确定了再散射过程。二阶 SRSS 产生的热电子几乎垂直于密度梯度传播，并获得与一阶 SRSS 几乎相同的能量，但没有级联加速产生超热电子。对各种点火条件的参数研究表明，SRSS 和相关的再散射是惯性约束聚变中稳健而重要的过程。

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Rescattering of stimulated Raman side scattering in nonuniform plasmas

Rescattering of stimulated Raman side scattering (SRSS) is observed for the first time via two-dimensional (2D) particle-in-cell (PIC) simulations. We construct a theoretical model for the rescattering process, which can predict the region of occurrence of mth-order SRSS and estimate its threshold. The rescattering process is identified by the 2D PIC simulations under typical conditions of a direct-drive inertial confinement fusion scheme. Hot electrons produced by second-order SRSS propagate nearly perpendicular to the density gradient and gain nearly the same energy as in first-order SRSS, but there is no cascade acceleration to produce superhot electrons. Parametric studies for a wide range of ignition conditions show that SRSS and associated rescatterings are robust and important processes in inertial confinement fusion.

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来源期刊

Matter and Radiation at Extremes Physics and Astronomy-Atomic and Molecular Physics, and Optics

CiteScore

8.60

自引率

9.80%

发文量

160

审稿时长

15 weeks

期刊介绍： Matter and Radiation at Extremes (MRE), is committed to the publication of original and impactful research and review papers that address extreme states of matter and radiation, and the associated science and technology that are employed to produce and diagnose these conditions in the laboratory. Drivers, targets and diagnostics are included along with related numerical simulation and computational methods. It aims to provide a peer-reviewed platform for the international physics community and promote worldwide dissemination of the latest and impactful research in related fields.