论文标题
冲击等离子体中的通货膨胀刺激拉曼散射
Inflationary stimulated Raman scattering in shock-ignition plasmas
论文作者
论文摘要
在冲击式惯性限制融合方案中，高强度激光器通过不均匀的冠状血浆传播，驱动旨在引起燃料点火的冲击。在高强度的点火器激光脉冲期间，长期长度等离子体中的SRS反向散射很可能处于动力学状态。在这项工作中，我们使用一维粒子中的粒子模拟表明，动力学效应引起的非线性频移，导致在不均匀的血浆中刺激的拉曼散射（SRS）的生长远远超过了流体理论的预测，所谓的载流量SRS或ISR。我们发现，ISR发生在与冲击 - 点数和其他直接惯性限制融合方案相关的广泛密度尺度长度上。冲击点击等离子体中ISR的存在对惯性限制融合的理论收益具有影响。在这里，我们量化了ISRS发作的强度阈值，以进行冲击 - 点击相关参数。
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.
