多能复合谱电子束与X射线能量沉积剖面的等效性  

Equivalence of energy deposition profile in target between electron beam of multi-energy composite spectrum and X-ray

作　　者：刘学[1] 冉宪文[1,2] 徐志宏[1] 汤文辉[1] Liu Xue Ran Xian-Wen Xu Zhi-Hong Tang Wen-Hui(College of Science, National University of Defense Technology, Changsha 410073, China Monitoring and Modeling of Electromagnetic Environment in Near Space Key Laboratory of General Universities of Hunan Province, Changsha University of Science and Technology, Changsha 410015, China)

机构地区：[1]国防科学技术大学理学院,长沙410073 [2]长沙理工大学近地空间电磁环境监测与建模湖南省普通高校重点实验室,长沙410015

出　　处：《物理学报》2017年第2期250-256,共7页Acta Physica Sinica

基　　金：武器装备预研项目(批准号:51311020201);长沙理工大学近地空间电磁环境监测与建模湖南省普通高校重点实验室开放基金(批准号:20150104)资助的课题~~

摘　　要：以模拟等效核爆X射线热-力学效应为目标,从能量沉积剖面着手,对给定多能复合谱电子束的入射角度进行了设计计算.给出了不同靶材、不同温度黑体谱X射线的等效设计计算结果.对比表明,该设计方法适用于多种靶材、多种目标X射线的等效设计,并且设计后的电子束能够提高模拟目标X射线的热-力学效应的逼真度.It has great significance to study the thermal-mechanical effects of X-ray in assessing the viability of space-crafts,the penetration ability of missiles and testing the effectiveness of the anti-nuclear reinforcement measures. However,it is rather difficult to construct a suitable X-ray source in laboratory. During recent decades, pulsed electron beam with multi-energy composite spectrum has become a most important simulation source of X-ray to study its thermalmechanical effects. And energy deposition profile in target material is the basis for studying the thermo-mechanical effects. However, under the same incident conditions, the energy deposition profile of pulsed electron beam with multienergy composite spectrum in target material is extremely different from X-ray’s, and the equivalence between the two beams is quite low. Thus, it is very important to adjust the energy spectrum and the incident mode of pulsed electron beam so as to improve their equivalence. In this paper, we use the energy deposition profiles of electron beam and X-ray in different kinds of material. MCNP is used to calculate their energy deposition profiles in target materials.Two kinds of blackbody X-rays with the equivalent temperatures of 3 and 5 keV and energy density of 200 J/cm2 are chosen for an optimization target. Aluminum, copper and titaniumare chosen as the target materials. Based on the change law of electron beam’s energy deposition profile when the electron beam hits the target material at different incident angles, a theoretical model is established. Then, taking advantage of simulated annealing algorithm, we use the MATLAB to carry out numerical calculation and finally the numerical optimization results about the incident angle spectrum and energy density of electron beam are obtained. After optimization, the energy deposition of pulsed electron beam with multi-energy composite spectrum is well adjusted. The peak energy deposition and change of gradient of electron beam are of wonderful consistency with X-ray’s. The

关 键 词：脉冲电子束 X射线 等效性 入射角 

分 类 号：O434.14[机械工程—光学工程]