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

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

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.

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

Received: 21 October 2013
Revised: 26 December 2013
Accepted manuscript online:

PACS:	52.57.-z	(Laser inertial confinement)
	52.38.-r	(Laser-plasma interactions)
	52.65.Rr	(Particle-in-cell method)
	41.75.-i	(Charged-particle beams)

Fund: 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).

Corresponding Authors: 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

Cite this article:

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 2014 Chin. Phys. B 23 055202

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

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