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Title: Characterization of supersonic radiation diffusion waves

Supersonic and diffusive radiation flow is an important test problem for the radiative transfer models used in radiation-hydrodynamics computer codes owing to solutions being accessible via analytic and numeric methods. We present experimental results with which we compare these solutions by studying supersonic and diffusive flow in the laboratory. Here, we present results of higher-accuracy experiments than previously possible studying radiation flow through up to 7 high-temperature mean free paths of low-density, chlorine-doped polystyrene foam and silicon dioxide aerogel contained by an Au tube. Measurements of the heat front position and absolute measurements of the x-ray emission arrival at the end of the tube are used to test numerical and analytical models. We find excellent absolute agreement with simulations provided that the opacity and the equation of state are adjusted within expected uncertainties; analytical models provide a good phenomenological match to measurements but are not in quantitative agreement due to their limited scope.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [2] ;  [2] ; ORCiD logo [2] ; ORCiD logo [2] ; ORCiD logo [2] ; ORCiD logo [2] ;  [2] ;  [2] ;  [2] ;  [1]
  1. AWE Aldermaston, Reading (United Kingdom)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-18-22001
Journal ID: ISSN 0022-4073
Grant/Contract Number:
AC52-06NA25396; AC52-07NA273444; AC52-006NA25396
Type:
Accepted Manuscript
Journal Name:
Journal of Quantitative Spectroscopy and Radiative Transfer
Additional Journal Information:
Journal Volume: 159; Journal Issue: C; Journal ID: ISSN 0022-4073
Publisher:
Elsevier
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10); UK Ministry of Defence
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; radiative transfer; diffusion; plasmas; shock waves; experiment; supersonic
OSTI Identifier:
1430025
Alternate Identifier(s):
OSTI ID: 1246414