激光等离子体中横场坍塌形成的密度空穴

Caviton by Collapsing Transverse wave in Laser Plasma

强激光与等离子体相互作用时在临界面附近发生强烈的波-波、波-粒相互作用,原来均匀分布的横等离子体波在调制不稳定作用下,发生坍塌破碎,局域化的高强度横等离激元通过有质动力排斥粒子形成密度空穴,同时诱发出高强度的低频磁场。采用从伏拉索夫方程和麦克斯韦方程组导出的非线性控制方程,数值模拟了非静态极限情况下无碰撞等离子体中密度空穴和低频磁场的演化过程。

The interaction between strong laser and plasma leads to a violent interaction of wave - wave and wave - particle in the critical surface. As a result,transverse field collapse and break due to modulational instabilities,and low frequency magnetic field is induced. The collapse strong field expels particle out by ponderomotive force and density cavitons form. The dynamical method and nonlinear equations for density disturbance in non - static limit case are adopted ,and the evolution of density cavitons and self - generated magnetic field is numerically simulated.