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Title: Conservation laws and conversion efficiency in ultraintense laser-overdense plasma interactions

Particle coupling to the oscillatory and steady-state nonlinear force of an ultraintense laser is studied through analytic modeling and particle-in-cell simulations. The complex interplay between these absorption mechanisms—corresponding, respectively, to “hot” electrons and “hole punching” ions—is central to the viability of many ultraintense laser applications. Yet, analytic work to date has focused only on limiting cases of this key problem. In this paper, we develop a fully relativistic model in 1-D treating both modes of ponderomotive light absorption on equitable theoretical footing for the first time. Using this framework, analytic expressions for the conversion efficiencies into hole punching ions and into hot electrons are derived. Solutions for the relativistically correct hole punching velocity and the hot electron Lorentz factor are also calculated. Excellent agreement between analytic predictions and particle-in-cell simulations is demonstrated, and astrophysical analogies are highlighted.
Authors:
 [1] ;  [2] ; ;  [3] ;  [1]
  1. Department of Physics and Astronomy, MS 108, Rice University, Houston, Texas 77005 (United States)
  2. (United States)
  3. Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
Publication Date:
OSTI Identifier:
22218546
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 10; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CONSERVATION LAWS; ELECTRONS; LASERS; LIGHT TRANSMISSION; MATHEMATICAL SOLUTIONS; NONLINEAR PROBLEMS; PLASMA SIMULATION; PLASMA WAVES; PONDEROMOTIVE FORCE; RELATIVISTIC PLASMA; STEADY-STATE CONDITIONS; VISIBLE RADIATION