X射线辐照圆柱腔体SGEMP电子发射参数的计算  

Calculation of Electron Emission Parameter of SGEMP in Cylinder Cavity Irradiated by X-Rays

作　　者：陈剑楠 陶应龙 牛胜利 CHEN Jian-nan;TAO Ying-long;NIU Sheng-li(Northwest Institute of Nuclear Technology,Xi’an 710024,China)

机构地区：[1]西北核技术研究院,西安710024

出　　处：《现代应用物理》2020年第1期58-66,共9页Modern Applied Physics

基　　金：强脉冲辐射环境模拟与效应国家重点实验室专项经费资助项目(SKLIPR1601Z)。

摘　　要：用MCNP程序对X射线辐照圆柱腔端面和侧面激励光电子发射的过程进行模拟,计算得到了出射电子的能谱、θ角分布及产额等发射参数随X射线入射状态的变化规律,并给出了处理曲面发射问题的蒙特卡罗(MC)统计方法,拟合得到了能谱参数E1随黑体温度和入射角变化的经验公式。利用MC抽样方法给出了将电子发射参数与3维全电磁PIC程序结合的宏粒子构建方式,并完成了X射线辐照圆柱腔体侧面激励的系统电磁脉冲场环境的模拟计算。结果表明,在模型边、角等几何变化处容易出现电场强度、磁场强度的极大值,需要对这些部位进行有效的抗系统电磁脉冲加固。This paper employs MCNP program to calculate the electron spectrum,angular distribution,and yield varying with the incident rays when a cylinder cavity is irradiated by X-rays at head face and side face incidences separately,and offers the MC statistical method to deal with the curved emitting surface.As for the electron spectrum,the empirical formula of energy spectrum parameter E 1 with the black-body temperatures and incident angles are calculated.Then,the macro-particle construction method for combining the electron emission parameters with 3-D PIC code by MC sampling is provided,and the simulation of SGEMP fields of cylinder side irradiated model is performed.The results indicate that the maximum values of electric field strength and magnetic field strength are easy to appear on the side or at the corner of the model,which needs to be strengthened effectively against the SGEMP.

关 键 词：系统电磁脉冲 电子发射参数 MONTE CARLO方法 宏粒子 

分 类 号：O434.14[机械工程—光学工程]