Influence of Compton scattering on the modulation instability in un-magnetized plasma
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摘要: 为了研究Compton散射对未磁化等离子体调制不稳定性的影响,采用多光子非线性Compton散射模型,对Compton散射下的未磁化等离子体调制不稳定性进行了理论分析和实验验证,取得了散射对调制不稳定性的时间增长率、非线性色散和控制影响的重要数据,提出了将入射光和Compton散射光作为形成调制不稳定性的新机制。结果表明,Compton散射使未磁化等离子体的自调制不稳定性的最大时间增长率和激光自聚焦较散射前减小,等离子体截面附近处调制不稳定性的时间增长率较散射前增大。Abstract: In order to study effect of Compton scattering on the modulation instability in the un-magnetized plasma,the modulation instability of the un-magnetized plasma under Compton scattering was analyzed and simulated based on the model of the multi-photon nonlinear Compton scattering.Some important data about effect of Compton scattering on the time rise rate of the modulation instability,the nonlinear dispersion and control were obtained,and a new mechanism of the modulation instability formed by the incident light and the Compton scattering was put forward.The result shows that the maximum time rise rate of the modulation instability and laser self-focusing in the un-magnetized laser-plasma becomes smaller than before the Compton scattering,and the time rise rate of the modulation instability in the vicinity of the laser-plasma surface is increased.
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