Compton散射对线偏光在相对论等离子体中调制不稳定性的影响  

Influences of modulation instability on Compton scattering to linearly polarized laser pulse in relativistic plasma

作　　者：高海林[1] 皮小力[1] 郝东山[2] 

机构地区：[1]河南工业职业技术学院,南阳473009 [2]郑州华信学院信息工程系,新郑451150

出　　处：《核聚变与等离子体物理》2014年第3期214-218,共5页Nuclear Fusion and Plasma Physics

基　　金：河南省基础与前沿技术研究资助项目(092300410227)

摘　　要：应用多光子非线性Compton散射模型、电磁波非线性色散方程和Karpman方法,研究了Compton散射对线偏光在相对论等离子体中调制不稳定性的影响,给出了等离子体的非线性色散、控制和调制不稳定性增长率的修正方程,并进行了数值模拟。结果表明:与散射前相比,随无量纲化频率值减小,即趋于等离子体临界面处,散射使相同扰动波数引起的调制不稳定性增长率更大,使等离子体临界面处的调制不稳定性增长率较其余位置尤为显著。这是由于散射光使等离子体非线性增强,形成了激光场自聚焦和自成丝的缘故。By using the model of multi-photon nonlinear Compton scattering, the nonlinear dispersion relation and Karpman’s model, the influences of the modulation instability on Compton scattering to the linear polarized light in relativistic plasma were studied, the revised equations on the nonlinear dispersion, the control and the growth rate of the modulation instability were given out, and these equations are simulated. The results show that under the same perturbation wave numbers, the even big rate of the modulation instability near the plasma surface are taken place by Compton scattering along with the decreasing of the numbers of the no gauge frequency than before Compton scattering, and the even marked growth rate of the modulation instability near the plasma surface are taken place near the plasma surface than other places. Because the plasma nonlinear is increased by the scattering, the self-focusing and self-turned fine silk are formed.

关 键 词：非线性色散方程 调制不稳定性 增长率 耦合 多光子非线性COMPTON散射 

分 类 号：O431[机械工程—光学工程]