飞秒激光与等离子体相互作用中自生磁场的热电机制  

Thermoelectric mechanism for self-generated magnetic field in femtosecond laser-plasma interaction

作　　者：阿不都热苏力 帕孜来提[1] 帕力哈提[1] 

机构地区：[1]新疆大学物理科学与技术学院,乌鲁木齐830046

出　　处：《强激光与粒子束》2013年第7期1709-1714,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(10965008;11164030);新疆大学校院联合基金项目(XY110106)

摘　　要：采用理论分析和数值模拟研究了考虑相对论效应的自生磁场及其产生机制,给出了自生磁场的解析表达式,得到了温度梯度和密度梯度的非共线性所引起的自生磁场空间分布的时间演化关系。数值结果表明,当峰值强度为1019 W/cm2的激光作用于凹形靶前表面时,在等离子体表面领域观察到的自生磁场最大值为51×102 T量级,与实验测量结果相符合。To understand the self-generated magnetic field induced from the non-parallel property of temperature gradient and density gradient in the ultra-intense laser-plasma interaction, we apply the theoretical analysis and numerical simulation to studying the self-generated magnetic field in consideration of relativistic effects and its generation mechanism, then derive the ana- lytical expressions of self-generated magnetic field, and obtain the time evolution of the spatial distribution of self-generated mag- netic field. The simulation results show that once the ultra-intense laser pulse with an intensity of 10^19 W/cm2 irradiates the circu- lar concave target, one can observe the self-generated magnetic field with the maximum magnitude at the order of 51×10/ T on the surface of the plasma, which are consistent with the experimental measurement.

关 键 词：飞秒激光 温度梯度和密度梯度非共线性 热电机制 数值模拟 自生磁场 

分 类 号：O434.12[机械工程—光学工程]