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Title: Heating a plasma by a broadband stream of fast electrons: Fast ignition, shock ignition, and Gbar shock wave applications

An exact analytic solution is found for the steady-state distribution function of fast electrons with an arbitrary initial spectrum irradiating a planar low-Z plasma with an arbitrary density distribution. The solution is applied to study the heating of a material by fast electrons of different spectra such as a monoenergetic spectrum, a step-like distribution in a given energy range, and a Maxwellian spectrum, which is inherent in laser-produced fast electrons. The heating of shock- and fast-ignited precompressed inertial confinement fusion (ICF) targets as well as the heating of a target designed to generate a Gbar shock wave for equation of state (EOS) experiments by laser-produced fast electrons with a Maxwellian spectrum is investigated. A relation is established between the energies of two groups of Maxwellian fast electrons, which are responsible for generation of a shock wave and heating the upstream material (preheating). The minimum energy of the fast and shock igniting beams as well as of the beam for a Gbar shock wave generation increases with the spectral width of the electron distribution.
Authors:
 [1] ; ; ;  [2]
  1. Russian Academy of Sciences, Lebedev Physical Institute (Russian Federation)
  2. Centre Lasers Intenses et Applications, University of Bordeaux-CNRS-CEA (France)
Publication Date:
OSTI Identifier:
22472069
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 121; Journal Issue: 3; Other Information: Copyright (c) 2015 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANALYTICAL SOLUTION; DISTRIBUTION FUNCTIONS; ELECTRON BEAM TARGETS; ELECTRONS; EQUATIONS OF STATE; HEAT TREATMENTS; HEATING; INERTIAL CONFINEMENT; ION BEAM TARGETS; LASER TARGETS; LASER-PRODUCED PLASMA; PLASMA HEATING; SHOCK WAVES; STREAMS