Inflationary stimulated Raman scattering in shock-ignition plasmas

S. Spencer, A. Seaton, T. Goffrey, T. Arber
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引用次数: 6

Abstract

In the shock-ignition inertial confinement fusion scheme, high-intensity lasers propagate through an inhomogeneous coronal plasma, driving a shock designed to cause fuel ignition. During the high-intensity ignitor laser pulse, SRS backscatter in the long scale-length coronal plasma is likely to be in the kinetic regime. In this work, we use one-dimensional particle-in-cell simulations to show that there is a non-linear frequency shift caused by kinetic effects, resulting in the growth of Stimulated Raman Scattering (SRS) in an inhomogeneous plasma far exceeding the predictions of the fluid theory, so-called inflationary SRS or iSRS. We find that iSRS occurs over a wide range of density scale-lengths relevant to shock-ignition and other directly-driven inertial confinement fusion schemes. The presence of iSRS in shock-ignition plasmas has implications for the theoretical gains from shock-ignition inertial confinement fusion. Here we quantify the intensity threshold for the onset of iSRS for shock-ignition relevant parameters.
激波点火等离子体中膨胀激发的拉曼散射
在激波点火惯性约束聚变方案中,高强度激光通过不均匀的日冕等离子体传播,驱动旨在引起燃料点火的激波。在高强度点火器激光脉冲作用下,SRS在长尺度长度日冕等离子体中的后向散射很可能处于动力学状态。在这项工作中,我们使用一维粒子在细胞中的模拟来表明,由于动力学效应引起的非线性频移,导致非均匀等离子体中受激拉曼散射(SRS)的增长远远超过了流体理论的预测,即所谓的暴胀SRS或iSRS。我们发现iSRS发生在与激波点火和其他直接驱动惯性约束聚变方案相关的密度尺度长度范围内。激波点火等离子体中iSRS的存在对激波点火惯性约束聚变的理论增益具有重要意义。在这里,我们量化了冲击点火相关参数的iSRS发作的强度阈值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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