光电子发射引起的系统电磁脉冲模拟研究?  

Simulation on a system generated electromagnetic pulse induced by photoelectrons emitted from plate

作　　者：孙会芳[1,2] 董志伟[1,2] 张芳[1,2] 

机构地区：[1]中国工程物理研究院复杂电磁环境实验室,四川绵阳621900 [2]北京应用物理与计算数学研究所,北京100094

出　　处：《强激光与粒子束》2014年第9期218-222,共5页High Power Laser and Particle Beams

基　　金：中国工程物理研究院科学技术发展基金项目(2011B0402068)

摘　　要：基于给定光电子的时间、能量谱,分析研究了从有界平面金属向自由空间发射的光电子所引起的系统电磁脉冲效应;采用2.5维全电磁粒子模拟(PIC)程序模拟研究了光电子在空间的运动及分布规律、空间电磁场的组成成分及各组分场的特性。模拟与分析表明:系统电磁脉冲的空间电磁场由直流本底场和辐射场两部分组成。直流场是径向场,随距离的增大迅速衰减;而辐射场又由两部分组成,一是电子从金属平板发射过程中产生的超辐射,二是电子在空间运动过程中产生的辐射场。对两种辐射场特性进行了深入的分析和研究。Based on the given temporal and energy spectrum of photoelectrons,the generation of an SGEMP(system generated electromagnetic pulse)induced by photoelectrons emitted from the bounded metal plate to free space is analyzed.The spatial motion characteristics and the distribution of photoelectrons,as well as the composition and the characteristics of the electromagnetic field are simulated by using a 2.5DPIC(particle-in-cell)code.It is shown that the simulated SGEMP field is composed of two parts:one is the quasi-DC background field and the other is a radiation field.The quasi-DC field is a radial field,attenuating quite rapidly with the distance from the emitted source.While the radiation field is also composed of two parts:one is the superradiation field produced during electron emission from the metal plate and the other is the normal radiation field produced in the process of photoelectron motion in space.The characteristics of the two kinds of radiation field are investigated.

关 键 词：光电子 PIC程序 系统电磁脉冲 超辐射 

分 类 号：O434.14[机械工程—光学工程]