Modulation instability in relativistic laser plasmas
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摘要: 为了研究相对论性强激光与等离子体相互作用时自生磁场的调制不稳定性,从一组考虑了横等离激元波-波、波-粒相互作用和电子相对论效应的非线性动力学控制方程出发,通过线性分析得到了横扰动的色散方程。结果表明,自生磁场由于调制不稳定性,将会坍塌形成小尺度的局域结构。选取适当的参量,计算得到的自生磁场的特征尺度与已有理论模型的结果一致。Abstract: The modulation instability of self-generated magnetic field in the super strong relativistic laser-plasma interactions was investigated from a set of nonlinear kinetic governing equations taking into account of the wave-wave, wave-particle interactions and the relativistic effect of electrons. On the basis of the nonlinear kinetic governing equations, the dispersion equation of transverse perturbation was obtained through linear analysis. Theoretical analysis and numerical calculation indicate the spontaneous magnetic field will collapse and form a localized structure. Choosing appropriate parameters, the characteristic scale of magnetic field obtained from numerical calculation is consistent with the existing theoretical model.
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