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首页> 外文期刊>Plasma physics and controlled fusion >On the stimulated Raman sidescattering in inhomogeneous plasmas: revisit of linear theory and three-dimensional particle-in-cell simulations
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On the stimulated Raman sidescattering in inhomogeneous plasmas: revisit of linear theory and three-dimensional particle-in-cell simulations

机译：在非均相等离子体中刺激的拉曼边缘定形：线性理论的重新求解，三维粒子粒细胞模拟

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Stimulated Raman sidescattering (SRSS) in inhomogeneous plasma is comprehensively revisited on both theoretical and numerical aspects due to the increasing concern of its detriments to inertial confinement fusion. Firstly, two linear mechanisms of finite beam width and collisional effects that could suppress SRSS are investigated theoretically. Thresholds for the eigenmode and wave packet in a finite-width beam are derived as a supplement to the theory proposed by Mostrom and Kaufman (1979 Phys. Rev. Lett.. 42 644). Collisional absorption of SRSS is efficient at high-density plasma and high-Z material, otherwise, it allows emission of sidescattering. Secondly, we have performed the first three-dimensional particle-in-cell simulations in the context of SRSS to investigate its linear and nonlinear effects. Simulation results are qualitatively agreed with the linear theory. SRSS with the maximum growth gain is excited at various densities, grows to an amplitude that is comparable with the pump laser, and evolutes to lower densities with a large angle of emergence. Competitions between SRSS and other parametric instabilities such as stimulated Raman backscattering, two-plasmon decay, and stimulated Brillouin scattering are discussed. These interaction processes are determined by gains, occurrence sites, scattering geometries of each instability, and will affect subsequent evolutions. Nonlinear effects of self-focusing and azimuthal magnetic field generation are observed to be accompanied with SRSS. In addition, it is found that SRSS is insensitive to ion motion, collision (low-Z material), and electron temperature.
机译：由于其对惯性监禁融合的损害越来越多，因此在理论和数值方面受到了刺激的拉曼的全面性等离子体中的刺激拉曼（SRS）。首先，从理论上研究了两个可以抑制SRS的有限梁宽度和碰撞效果的线性机制。在有限宽度光束中的特征模和波包的阈值被推导为Mostrom和Kaufman（1979次）提出的理论的补充SRS的碰撞吸收是高密度等离子体和高Z材料的有效，否则允许排放边缘。其次，我们在SRS的背景下进行了第一三维粒子内模拟，以研究其线性和非线性效应。模拟结果与线性理论定性同意。具有最大增长增益的SRS在各种密度中兴奋，增长到与泵激光相当的振幅，并使具有大的出现角度的更低的密度。讨论了SRS和其他参数范围的竞争，如刺激的拉曼反向散射，双等离子衰减和刺激布里渊散射。这些相互作用过程由增益，发生位点，每个不稳定性的散射几何形状决定，并将影响随后的演变。观察到自聚焦和方位角磁场产生的非线性效应伴随着SRSS。另外，发现SRS对离子运动，碰撞（低Z材料）和电子温度不敏感。

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