Strongly Enhanced Stimulated Brillouin Backscattering in an Electron-Positron Plasma.
Strongly Enhanced Stimulated Brillouin Backscattering in an Electron-Positron Plasma.
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DOI：
10.1103/physrevlett.116.015004
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发表时间：
2015-12
影响因子：
8.6
通讯作者：
M. R. Edwards;N. Fisch;J. Mikhailova
中科院分区：
文献类型：
--
作者：
M. R. Edwards;N. Fisch;J. Mikhailova
在电子-正电子等离子体中，光的受激布里渊后向散射被大大增强，而受激拉曼散射被抑制。一个广义理论的电磁波和等离子体波之间的三波耦合在两个物种的等离子体与任意质量比，证实了一套全面的粒子在细胞模拟，揭示了违反普遍持有的假设的行为的电子-正电子等离子体。具体而言，在电子-正电子极限下，光与等离子体声波之间可以发生三波参数相互作用，并且声波相速度不同于其通常假设的值。
Stimulated Brillouin backscattering of light is shown to be drastically enhanced in electron-positron plasmas, in contrast to the suppression of stimulated Raman scattering. A generalized theory of three-wave coupling between electromagnetic and plasma waves in two-species plasmas with arbitrary mass ratios, confirmed with a comprehensive set of particle-in-cell simulations, reveals violations of commonly held assumptions about the behavior of electron-positron plasmas. Specifically, in the electron-positron limit three-wave parametric interaction between light and the plasma acoustic wave can occur, and the acoustic wave phase velocity differs from its usually assumed value.