Parametric instabilities of intense lasers from interaction with relativistic hot plasmas
Parametric instabilities of intense lasers from interaction with relativistic hot plasmas
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DOI：
10.1103/physreve.61.4362
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发表时间：
2000-04
期刊：
影响因子：
--
通讯作者：
Sheng;Mima;Sentoku;Nishihara
中科院分区：
文献类型：
--
作者：
Sheng;Mima;Sentoku;Nishihara
利用动量空间中的水袋分布，研究了强激光在相对论性热等离子体中的受激拉曼散射（SRS）和相对论性调制不稳定性（RMI）。考虑了两种情况：单热电子分布和附有热电子尾的冷等离子体。结果表明，高温和热电子尾都能显著降低不稳定生长速率，使波矢量空间中的不稳定区域发生位移，并改变冷等离子体理论的拉曼散射频谱。特别是，在低光强下，存在一个截止热速度，超过这个速度，SRS完全被抑制。在高光强下，由于SRS与RMI的合并，没有发现明显的截止热速度。
The stimulated Raman scattering (SRS) and relativistic modulational instability (RMI) of intense lasers in relativistic hot plasmas are studied, using the waterbag distribution in momentum space. Two cases are considered: a single hot electron distribution and a cold plasma attached with a hot electron tail. It is shown that both high temperatures and hot electron tails can significantly reduce the instability growth rates, shift the unstable regions in the wave-vector space, and change the Raman scattering frequency spectra from the cold plasma theory. In particular, at low-light intensities, there exists a cutoff thermal velocity beyond which SRS is completely suppressed. At high-light intensities, no clear cutoff thermal velocity is found owing to the merging of SRS with RMI.