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A computational study of x-ray emission from laser-irradiated Ge-doped foams

Source: Phys. Plasmas 17, 073111 (2010); doi:10.1063/1.3460817

Published 29 July 2010

KEYWORDS and PACS
Keywords
PACS
  • 52.25.Os
    Emission, absorption, and scattering of electromagnetic radiation from plasmas
  • 52.77.-j
    Plasma applications
  • 52.25.Kn
    Thermodynamics of plasmas
  • 52.25.Fi
    Plasma transport properties
  • 52.65.-y
    Plasma simulation
  • YEAR: 2010
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PUBLICATION DATA
ISSN:
1553-9601 (online)
Publisher:
AIP is a member of CrossRef AIP
Jeffrey D. Colvin, Kevin B. Fournier, Mark J. May, and Howard A. Scott
Lawrence Livermore National Laboratory, Livermore, California 94551, USA
New advances in fabrication of low-density high-Z-doped foams have opened new windows on understanding how materials that are not in local thermodynamic equilibrium (LTE) are heated and radiate. Simulations are discussed in this paper of the x-ray spectral emissions from laser-irradiated very low-density Ge-doped silica aerogel targets using a two-dimensional radiation-hydrodynamics code incorporating a modern non-LTE superconfiguration atomic model. Details of the computational model are presented, and it is shown that, for the long-scale-length, subcritical-density, ~2–3  keV electron temperature plasmas created in experiments at the Omega laser facility [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)], the simulations provide a close match to both the measured Ge L-shell emission (~1–1.5  keV) and the measured Ge K-shell emission (~10–11  keV), but only by accounting properly for nonlocal thermal conduction. The older average-atom atomic model is shown to be inadequate for these non-LTE plasmas.
History: Received 8 March 2010; accepted 15 June 2010; published 29 July 2010
Permalink: http://link.aip.org/link/?PHPAEN/17/073111/1

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