Laser pulse propagation and enhanced energy coupling to fast electrons in dense plasma gradients

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	Laser pulse propagation and enhanced energy coupling to fast electrons in dense plasma gradients
	Gray, RJ ; Carroll, DC ; Yuan, XH ; Brenner, CM ; Burza, M ; Coury, M ; Lancaster, KL ; Lin, XX ; Li, YT ; Neely, D ; Quinn, MN ; Tresca, O ; Wahlstrom, CG ; McKenna, P
刊名	NEW JOURNAL OF PHYSICS
	2014
卷号	16
关键词	laser-plasma interaction laser pulse propagation fast electron generation
ISSN号	1367-2630
通讯作者	Gray, RJ (reprint author), Univ Strathclyde, SUPA, Dept Phys, Glasgow G4 0NG, Lanark, Scotland.
中文摘要	Laser energy absorption to fast electrons during the interaction of an ultra-intense (10(20) Wcm(-2)), picosecond laser pulse with a solid is investigated, experimentally and numerically, as a function of the plasma density scale length at the irradiated surface. It is shown that there is an optimum density gradient for efficient energy coupling to electrons and that this arises due to strong self-focusing and channeling driving energy absorption over an extended length in the preformed plasma. At longer density gradients the laser filaments, resulting in significantly lower overall energy coupling. As the scale length is further increased, a transition to a second laser energy absorption process is observed experimentally via multiple diagnostics. The results demonstrate that it is possible to significantly enhance laser energy absorption and coupling to fast electrons by dynamically controlling the plasma density gradient.
资助信息	EPSRC (UK Plasma HEC Consortium) [EP/J003832/1, EP/L001357/1, EP/L000237/1]; Air Force Office of Scientific Research, Air Force Material Command, USAF [FA8655-13-1-3008]; Swedish Research Council; National Natural Science Foundation of China [10925421, 10720101075]; National Basic Research Program of China [2007CB815101]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59399]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Gray, RJ,Carroll, DC,Yuan, XH,et al. Laser pulse propagation and enhanced energy coupling to fast electrons in dense plasma gradients[J]. NEW JOURNAL OF PHYSICS,2014,16.
APA	Gray, RJ.,Carroll, DC.,Yuan, XH.,Brenner, CM.,Burza, M.,...&McKenna, P.(2014).Laser pulse propagation and enhanced energy coupling to fast electrons in dense plasma gradients.NEW JOURNAL OF PHYSICS,16.
MLA	Gray, RJ,et al."Laser pulse propagation and enhanced energy coupling to fast electrons in dense plasma gradients".NEW JOURNAL OF PHYSICS 16(2014).