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首页> 外文期刊>Plasma physics and controlled fusion >The interplay between the kinetic nonlinear frequency shift and the flowing gradient in stimulated Brillouin scattering
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The interplay between the kinetic nonlinear frequency shift and the flowing gradient in stimulated Brillouin scattering

机译：动力学非线性频移与刺激布里渊散射的流动梯度之间的相互作用

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摘要

The effect of the kinetic nonlinear frequency shift (KNFS) on backward stimulated Brillouin scattering (SBS) in homogeneous plasmas and inhomogeneous flowing plasmas is investigated by three-wave coupled-mode equations. When the positive contribution to the KNFS from electrons as well as the negative contribution from ions is included, the net KNFS can become positive at a large electron-ion temperature ratio ZT(e)/T-i. In homogeneous plasmas, KNFS can greatly reduce the SBS reflectivity at low or large ZT(e)/T-i but has a weak effect on SBS ZT(e)/T-i where the positive frequency shifts from electrons almost cancels out the negative shifts from ions. In inhomogeneous plasmas, the net negative frequency shift can enhance the backward SBS reflectivity for the negative gradient of the plasma flowing, and can suppress the reflectivity for the positive case. On the contrary, the net positive frequency can suppress the reflectivity for the negative case of the flowing gradient and enhance the reflectivity for the positive case. This indicates that the SBS in inhomogeneous flowing plasmas can be controlled by changing the sign of the nonlinear frequency shift.
机译：通过三波耦合模式方程研究了在均匀等离子体中的后向刺激布里渊散射（SBS）上的动力学非线性频移（KNF）的效果。当包括来自电子的KNF的正贡献以及来自离子的负贡献时，净KNF可以在大的电子离子温度比ZT（e）/ T-1处变正。在均匀的等离子体中，KNF可以大大减少低或大ZT（e）/ T-I的SBS反射率，但对SBS ZT（e）/ T-1具有弱效应，其中来自电子的正频率几乎取消离子的负偏移。在不均匀的等离子体中，净负频频移可以增强对等离子体流动的负梯度的向后SBS反射率，并且可以抑制阳性壳体的反射率。相反，净正频可以抑制流动梯度的负壳的反射率，并增强阳性情况的反射率。这表明可以通过改变非线性频移的符号来控制非均匀流动等离子体中的SBS。

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