激光等离子体临界面处的强朗缪尔湍动

为了描绘出激光等离子体临界面处的强朗缪尔湍动,分析了激光等离子体中电磁波、朗缪尔波与离子声波的三波相互作用,采用二维三分量通过快速傅里叶变换方法数值求解萨哈罗夫方程。从图像中可看出,激光与等离子体的相互作用导致横波与朗缪尔波之间出现的能量均分现象和密度空穴。求出了强朗缪尔波的强度和密度空穴的尺度,结果与粒子模拟的预测结果及实验所测数据大致相符。结果表明,数值分析仍是探究强朗缪尔湍动真实物理图像的一个有效途径。

Strong Langmuir turbulence excited by laser near critical surface

The collapse behavior of Langmuir waves excited by laser near critical surface is numerically studied. On the basis of Zakharov equations in frame of strong turbulence,it is shown that Langmuir waves excited by transverse pumping plasmons near critical surface may collapse,leading to the formation of density cavity due to ponderomotive force. The interaction will lead to tendency of an equilibration of energy over both of transverse and Langmuir plasmons with the same frequencies near ωp,which is agreement with our numerical analysis. The value of width of the density cavity estimated is similar to the experimental result.