超强激光与等离子体相互作用中的自生磁场及三维模拟

3D Simulation of Self-Generated Magnetic Fields by the High Laser Plasma Interactions

用3维粒子模拟程序对超热电子在等离子体靶表面中向前传输时所激发的电流密度,电场和磁场的发展过程进行模拟研究。数值模拟表明,在线性强激光作用下,由于电子初始时刻的无规则热运动,在等离子体临界表面上激发不稳定性,而不稳定性随时间发展和激光功率的进一步深入到等离子体内部,最终使等离子体表面处激发饱和自生磁场,饱和自生磁场对激光有质动力推开电子时所形成的高能电子运动产生抑制作用.通过该研究寻找相对论效应条件下的自生磁场,并为进一步开拓其在高能离子束的应用提供理论和技术上的指导。

Stimulated Current density、electric and Magnetic Field by a linearly-polarized laser interacting with a plasma studied by using electromagnetic relativistic particle-in cell program simulation. When the laser pulse is incident with p-polarization electromagnetic instability is observed on the plasma surface.Later the instability propagates into the plasma bulk forming bubble structures,which propagate forward subsequently.The development of this instability depends upon the initial plasma density. the strong magnetic field excited by instability makes the electron beam deposit the energy within very short distance, and, meanwhile, restrain the electron thermo current formed when the laser ponderomotive force burst through the electron. looking for self-generated magnetic field in the relativistic effect under the conditions of the study, and to further exploreprovide theoretical and technical guidance in the application of the laser accelerator.