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

doi:10.1088/1674-1056/23/5/055202

中国物理B ›› 2014, Vol. 23 ›› Issue (5): 55202-055202.doi: 10.1088/1674-1056/23/5/055202

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇下一篇

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

王欢^{a b}, 曹莉华^{a b c}, 赵宗清^d, 郁明阳^{e f}, 谷渝秋^d, 贺贤土^{a b c e}

a Center for Applied Physics and Technology, Peking University, Beijing 100871, China;
b Key Laboratory of High Energy Density Physics Simulation of the Ministry of Education, Peking University, Beijing 100871, China;
c Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
d Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China;
e Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, China;
f Institute for Theoretical Physics I, Ruhr University, Bochum D-44780, Germany

收稿日期:2013-10-21 修回日期:2013-12-26 出版日期:2014-05-15 发布日期:2014-05-15
基金资助:
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), and the Science and Technology Foundation of China Academy of Engineering Physics (Grant No. 2011A0102008).

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

Wang Huan (王欢)^{a b}, Cao Li-Hua (曹莉华)^{a b c}, Zhao Zong-Qing (赵宗清)^d, Yu Ming-Yang (郁明阳)^{e f}, Gu Yu-Qiu (谷渝秋)^d, He Xian-Tu (贺贤土)^{a b c e}

a Center for Applied Physics and Technology, Peking University, Beijing 100871, China;
b Key Laboratory of High Energy Density Physics Simulation of the Ministry of Education, Peking University, Beijing 100871, China;
c Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
d Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China;
e Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, China;
f Institute for Theoretical Physics I, Ruhr University, Bochum D-44780, Germany

Received:2013-10-21 Revised:2013-12-26 Online:2014-05-15 Published:2014-05-15
Contact: Cao Li-Hua, He Xian-Tu E-mail:cao_lihua@iapcm.ac.cn;xthe@iapcm.ac.cn
About author:52.57.-z; 52.38.-r; 52.65.Rr; 41.75.-i
Supported by:
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), and the Science and Technology Foundation of China Academy of Engineering Physics (Grant No. 2011A0102008).

摘要/Abstract

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.

关键词: inner-surface roughness of cone target, particle-in-cell simulation, vacuum-heating model, laser reflection

Abstract: 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.

Key words: inner-surface roughness of cone target, particle-in-cell simulation, vacuum-heating model, laser reflection

中图分类号: (Laser inertial confinement)

52.57.-z

52.38.-r (Laser-plasma interactions) 52.65.Rr (Particle-in-cell method) 41.75.-i (Charged-particle beams)

王欢, 曹莉华, 赵宗清, 郁明阳, 谷渝秋, 贺贤土. Effect of inner-surface roughness of conical target on laser absorption and fast electron generation[J]. 中国物理B, 2014, 23(5): 55202-055202.

Wang Huan (王欢), Cao Li-Hua (曹莉华), Zhao Zong-Qing (赵宗清), Yu Ming-Yang (郁明阳), Gu Yu-Qiu (谷渝秋), He Xian-Tu (贺贤土). Effect of inner-surface roughness of conical target on laser absorption and fast electron generation[J]. Chin. Phys. B, 2014, 23(5): 55202-055202.

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

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

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