摘要
用二维半粒子模拟程序模拟研究了超强激光束与过稠密等离子体的相互作用过程 ,发现存在有质动力加速电子及由该电子再拉动离子而产生的等离子体密度通道 ,也发现由高能电子流产生的高强度自生磁场。模拟研究了三种空间形状的激光对钻孔的影响 ,发现激光场径向梯度越大 ,钻孔速度越大 ,越有利于钻孔 ;对反射波进行诊断 ,发现了奇次谐波和偶次谐波。
The interaction of ultra high intensity laser with overdense plasma is studied using a 2.5D particle si mulation code. A channel is formed due to the extremely large ponderomotive force associated wi th laser pulse. Strong self-generated magnetic fields produced by strong flow of high-energy electrons are observed. Three ki nds of spatial profiles of laser intensity are used to investigate the effect of laser spatial profile on boring , and it is found that the boring effect is stronger when the radial gradient of laser intensity is bigger. Odd and even harmonics are found in reflected waves.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2000年第5期589-592,共4页
High Power Laser and Particle Beams
基金
国家自然科学基金资助课题!( 19885 0 0 8)
国家 863惯性约束聚变领域资助课题
关键词
激光
等离子体
超强激光钻孔机制
粒子模拟
laser plasma interaction
ultra short laser pulse
boring effect
self-generated magnetic field
harmonic
