Laser imprint reduction for the critical-density foam buffered target   driven by a relatively strong foot pulse at early stage of laser   implosions

doi:10.1063/1.4938037

CORC > 北京大学 > 工学院

	Laser imprint reduction for the critical-density foam buffered target driven by a relatively strong foot pulse at early stage of laser implosions
	Li, J. W. ; Kang, W. ; He, X. T. ; Li, J. H. ; Zheng, W. D.
刊名	PHYSICS OF PLASMAS
	2015
关键词	INERTIAL CONFINEMENT FUSION ABLATION DESIGN PROPAGATION MITIGATION RADIATION
DOI	10.1063/1.4938037
英文摘要	In order to reduce the effect of laser imprint in direct-drive ignition scheme a low-density foam buffered target has been proposed. This target is driven by a laser pulse with a low-intensity foot at the early stage of implosion, which heats the foam and elongates the thermal conduction zone between the laser absorption region and ablation front, increasing the thermal smoothing effect. In this paper, a relatively strong foot pulse is adopted to irradiate the critical-density foam buffered target. The stronger foot, near 1 x 10(14) W/cm(2), is able to drive a radiative shock in the low-density foam, which helps smooth the shock and further reduce the effect of laser imprint. The radiative shock also forms a double ablation front structure between the two ablation fronts to further stabilize the hydrodynamics, achieving the similar results to a target with a high-Z dopant in the ablator. 2D analysis shows that for the critical-density foam buffered target irradiated by the strong foot pulse, the laser imprint can be reduced due to the radiative shock in the foam and an increased thermal smoothing effect. It seems viable for the critical-density foam buffered target to be driven by a relatively strong foot pulse with the goal of reducing the laser imprint and achieving better implosion symmetry in the direct-drive laser fusion. (C) 2015 AIP Publishing LLC.; National Natural Science Foundation of China [11175027, 11275028, 11371065, 11475032]; SCI(E); EI; ARTICLE; li_jiwei@iapcm.ac.cn; 12; 22
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/435700]
专题	工学院
推荐引用方式 GB/T 7714	Li, J. W.,Kang, W.,He, X. T.,et al. Laser imprint reduction for the critical-density foam buffered target driven by a relatively strong foot pulse at early stage of laser implosions[J]. PHYSICS OF PLASMAS,2015.
APA	Li, J. W.,Kang, W.,He, X. T.,Li, J. H.,&Zheng, W. D..(2015).Laser imprint reduction for the critical-density foam buffered target driven by a relatively strong foot pulse at early stage of laser implosions.PHYSICS OF PLASMAS.
MLA	Li, J. W.,et al."Laser imprint reduction for the critical-density foam buffered target driven by a relatively strong foot pulse at early stage of laser implosions".PHYSICS OF PLASMAS (2015).