超短超强激光与铜靶相互作用产生Kα源的蒙特卡罗模拟  

Monte Carlo simulation of Kα source produced by ultrashort and ultrahigh laser interaction with Cu target

作　　者：赵宗清[1] 丁永坤[1] 谷渝秋[1] 王向贤[1] 洪伟[1] 王剑[1] 郝轶聃[1] 袁永腾[1] 蒲以康[2] 

机构地区：[1]中国工程物理研究院激光聚变研究中心,绵阳621900 [2]清华大学工程物理系,北京100084

出　　处：《物理学报》2007年第12期7127-7131,共5页Acta Physica Sinica

基　　金：中国工程物理研究院激光聚变研究中心高温高密度等离子体物理国家重点实验室创新基金资助的课题.~~

摘　　要：超短超强激光打靶产生的超热电子,与固体靶相互作用时会产生Kα线辐射.由经典定标律给出了法线方向超热电子的温度.利用蒙特卡罗方法,对超热电子在固体靶中的传输进行了研究,模拟了不同靶厚度情况下Kα产额和角分布及不同电子温度下Kα光子的转化效率.计算结果与实验符合较好.结果表明:在一定电子温度下,随着靶厚度的增加Kα光子产额会达到饱和,并会使Kα光子发射的各向异性变得更加严重;存在最佳的电子温度,使Kα线转化效率最高.When the superthermal electrons produced by ultrashort and ultrahigh laser interaeion with solid target tranport in the target, the Kα X-rays will irradiate from the target. According to classical scaling law, superthermal electrons＇ temprature in the normal direction can be got. Using Monte Carlo method, the tranportation of electrons in the solid target is researched. We simulate the Kα yield and spatial distribution for different target thickness, also simulate the Kα conversion efficiency versus temprature. Simulation result accords with experimental results. We conclude that, at a given temprature, the Kα yield will reach saturation and the spatial distribution will become more nonisotropic when the target thickness increases. There exists an optimial temprature for Kα X-rays conversion efficiency.

关 键 词：超短超强激光 超热电子 蒙特卡罗方法 Kα线 

分 类 号：TL61[核科学技术—核技术及应用]