激光-薄膜靶相互作用中前向超热电子的产额及能量转化效率  

Yield and energy conversion efficiency of the forward hot electrons from laser-foil target

作　　者：蔡达锋[1,2] 谷渝秋[2] 郑志坚[2] 周维民[2] 焦春晔[2] 温天舒[2] 

机构地区：[1]内江师范学院工程技术学院,内江641112 [2]中国工程物理研究院激光聚变研究中心,绵阳621900

出　　处：《核聚变与等离子体物理》2014年第1期12-16,共5页Nuclear Fusion and Plasma Physics

基　　金：国家自然科学基金资助项目(10975121);四川省教育厅科研项目(10ZA012)

摘　　要：采用飞秒激光与薄膜靶相互作用测量了前向超热电子的分布和能谱。结果显示,前向超热电子主要集中在靶背法线方向附近区域发射,而超热电子的能谱呈双温类麦克斯韦分布。根据所测超热电子能谱和分布推算出前向超热电子总产额约1.23×108shot-1和前向超热电子的总能量约4.65×1011keV.shot-1,最后给出激光能量转化为前向超热电子能量的转化效率约5.72×10-4,这些结果与文献[17]的较好地一致。The distribution and the energy spectrum of forward hot electrons produced by the interaction of fs-laser with foil target were measured. The results show that the forward hot electrons jet with a large angle width is mainly along the direction of rear normal of target; the energy spectrum of forward hot electrons is a Maxwellian-like distribution. The yield and energy of forward hot electrons is about 1.23×108shot-1 and 4.65×1011keV.shot-1, which were deduced from the distribution and the energy spectrum of forward hot electrons. The conversion efficiency of laser energy to forward hot electrons energy is about 5.72×10-4, which is better consistent with that from the reference [17].

关 键 词：飞秒激光 薄膜靶 前向超热电子 转化效率 

分 类 号：O434.12[机械工程—光学工程]