Effect of inner-surface roughness of conical target on laser absorption and fast electron generation  

作　　者：王欢 曹莉华 赵宗清 郁明阳 谷渝秋 贺贤土 

机构地区：[1]Center for Applied Physics and Technology,Peking University [2]Key Laboratory of High Energy Density Physics Simulation of the Ministry of Education,Peking University [3]Institute of Applied Physics and Computational Mathematics [4]Laser Fusion Research Center,China Academy of Engineering Physics [5]Institute for Fusion Theory and Simulation,Zhejiang University [6]Institute for Theoretical Physics I,Ruhr University

出　　处：《Chinese Physics B》2014年第5期392-396,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11175030,11175029,91230205,and 11375032);the National High-Tech ICF Committee of China,the National Basic Research Program of China(Grant Nos.2008CB717806 and 2011CB808104);the Science and Technology Foundation of China Academy of Engineering Physics(Grant No.2011A0102008)

摘　　要：The effect of inner-surface roughness of conical targets on the generation of fast electrons in the laser-cone interaction is investigated using particle-in-cell simulation. It is found that the surface roughness can reduce the fast-electron number （in the energy range E 〉 1 MeV） and energy, as compared to that from a cone with smooth inner wall. A scaling law for the laser reflectivity based on the vacuum-heating model is derived. Both theory and simulation indicate that laser reflection increases with the height-to-width ratio of the periodic inner surface structure and approaches that of a smooth cone as this ratio becomes zero.The effect of inner-surface roughness of conical targets on the generation of fast electrons in the laser-cone interaction is investigated using particle-in-cell simulation. It is found that the surface roughness can reduce the fast-electron number （in the energy range E 〉 1 MeV） and energy, as compared to that from a cone with smooth inner wall. A scaling law for the laser reflectivity based on the vacuum-heating model is derived. Both theory and simulation indicate that laser reflection increases with the height-to-width ratio of the periodic inner surface structure and approaches that of a smooth cone as this ratio becomes zero.

关 键 词：inner-surface roughness of cone target particle-in-cell simulation vacuum-heating model laserreflection 

分 类 号：TN249[电子电信—物理电子学]