激光辐照金属丝产生电子束的发散度  

Divergence of electron beams produced by laser irradiating on metal wires

作　　者：陈实[1] 黄娇凤[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《强激光与粒子束》2012年第12期3019-3022,共4页High Power Laser and Particle Beams

摘　　要：研究了激光辐照金属丝产生电子束的自身磁场对其发散度的影响。通过理论分析和量级估算得到:电子在金属丝附近运动时,同时受到金属丝电场和自身磁场的作用,聚集效应明显;当电子离开金属丝后,空间电荷效应的库仑排斥作用与自身磁场的聚集作用量级相当,近似认为可以保持已经具有的发散度。利用经典轨迹蒙特卡罗方法模拟了该过程,计算结果表明自身磁场可以解释电子束的发散度及其对金属丝长度的依赖关系。The effect of self-generated magnetic field of electron beams produced by laser irradiating on metal wires on the divergence of the electron beams is studied.The theoretical analysis and magnitude order estimation show that,between the laser spot and the right end of the wire,the electrons are subject to both electrostatic and self-generated magnetic fields,which leads to considerable collimation,and during their motion from the right end of the wire to IP stacks,the space-charge field and magnetic field roughly cancel each other and the divergence is maintained roughly.The classic trajectory Monte Carlo method is used to simulate this process,and the simulation result indicates that both the electron beam divergence and its dependence on wire length could be explained by the self-generated magnetic field.

关 键 词：激光电子束 发散度 自身磁场 蒙特卡罗方法 

分 类 号：TN244[电子电信—物理电子学]