Accelerating piston action and plasma heating in high-energy density laser plasma interactions

被引：6

作者：

Levy, M. C. ^{[1
,2
]}

Wilks, S. C. ^{[2
]}

Baring, M. G. ^{[1
]}

机构：

[1] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA

[2] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

来源：

HIGH ENERGY DENSITY PHYSICS | 2013年 / 9卷 / 01期

关键词：

High energy density laboratory astrophysics; HEDLA; Ultraintense laser plasma interaction; LPI; ABSORPTION;

D O I：

10.1016/j.hedp.2012.12.005

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

In the field of high-energy density physics (HEDP), lasers in both the nanosecond and picosecond regimes can drive conditions in the laboratory relevant to a broad range of astrophysical phenomena, including gamma-ray burst afterglows and supernova remnants. In the short-pulse regime, the strong light pressure (>Gbar) associated ultraintense lasers of intensity I > 10(18) W/cm(2) plays a central role in many HEDP applications. Yet, the behavior of this nonlinear pressure mechanism is not well-understood at late time in the laser-plasma interaction. In this paper, a more realistic treatment of the laser pressure 'hole boring' process is developed through analytical modeling and particle-in-cell simulations. A simple Liouville code capturing the phase space evolution of ponderomotively-driven ions is employed to distill effects related to plasma heating and ion bulk acceleration. Taking into account these effects, our results show that the evolution of the laser-target system encompasses ponderomotive expansion, equipartition, and quasi-isothermal expansion epochs. These results have implications for light piston-driven ion acceleration scenarios, and astrophysical applications where the efficiencies of converting incident Poynting flux into bulk plasma flow and plasma heat are key unknown parameters. Published by Elsevier B.V.

引用

页码：198 / 203

页数：6

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