Density modulation-induced absolute laser-plasma-instabilities: simulations and theory
Density modulation-induced absolute laser-plasma-instabilities: simulations and theory
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DOI：
10.1063/1.4983143
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发表时间：
2016-03
期刊：
影响因子：
--
通讯作者：
J. Li;R. Yan;Chuang Ren
中科院分区：
文献类型：
--
作者：
J. Li;R. Yan;Chuang Ren
Fluid simulations show that when a sinusoidal density modulation is superimposed on a linear density profile, convective instabilities can become absolutely unstable. This conversion can occur for two-plasmon-decay and stimulated Raman Scattering instabilities under realistic direct-drive inertial confinement fusion conditions and can affect hot electron generation and laser energy deposition. Analysis of the three-wave model shows that a sufficiently large change of the density gradient in a linear density profile can turn convective instabilities into absolute ones. An analytical expression is given for the threshold of the gradient change, which depends on the convective gain only.
