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首页> 外文期刊>Plasma Science & Technology >Simulations of Stimulated Raman Scattering in Low-Density Plasmas
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Simulations of Stimulated Raman Scattering in Low-Density Plasmas

机译:低密度等离子体中受激拉曼散射的模拟

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摘要

Stimulated Raman scattering (SRS) in a low-density plasma slab is investigated by particle-in-cell (PIC) simulations. The backward stimulated Raman scattering (B-SRS) dominates initially and erodes the head of the pump wave, while the forward stimulated Raman scattering (F-SRS) subsequently develops and is located at the rear part of the slab. Two-stage electron acceleration may be more efficient due to the coexistence of these two instabilities. The B-SRS plasma wave with low phase velocities can accelerate the background electrons which may be further boosted to higher energies by the F-SRS plasma wave with high phase velocities. The simulations show that the peaks of the main components in both the frequency and wave number spectra occur at the positions estimated from the phase-matching conditions.
机译:通过单元内粒子(PIC)模拟研究了低密度等离子体平板中的受激拉曼散射(SRS)。后向受激拉曼散射(B-SRS)最初占主导地位,并且侵蚀了泵浦波的波头,而后向受激拉曼散射(F-SRS)随后发展并位于平板的后部。由于这两个不稳定性的共存,两阶段电子加速可能更有效。具有低相速度的B-SRS等离子体波可以加速背景电子,该电子可以通过具有高相速度的F-SRS等离子体波进一步提升为更高的能量。仿真表明,频率谱和波数谱中主要成分的峰值都出现在根据相位匹配条件估计的位置。

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