Observation on radiation transfer experiments using k-shell absorption spectra

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Recent laser-produced plasma experiments have relied on spectroscopic comparisons with models to infer plasma temperatures. Here, the technique is applied to study thermal radiation transfer experiments. The transmission model combines high-quality atomic data with an ionization balance obtained from systematic expansions of the grand canonical ensemble. The latter avoids the ad hoc cutoffs required in free energy minimization schemes and includes Coulomb corrections usually neglected in other models. It is shown that the improved equation of state significantly affects inferred temperatures at the higher densities expected in the heat flow experiments. Even though good agreement is obtained between the experimental ... continued below

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18 p.

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Iglesias, C.A.; Chen, M.H.; McWilliams, D.L.; Nash, J.K. & Rogers, F.J. January 4, 1995.

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Description

Recent laser-produced plasma experiments have relied on spectroscopic comparisons with models to infer plasma temperatures. Here, the technique is applied to study thermal radiation transfer experiments. The transmission model combines high-quality atomic data with an ionization balance obtained from systematic expansions of the grand canonical ensemble. The latter avoids the ad hoc cutoffs required in free energy minimization schemes and includes Coulomb corrections usually neglected in other models. It is shown that the improved equation of state significantly affects inferred temperatures at the higher densities expected in the heat flow experiments. Even though good agreement is obtained between the experimental and theoretical transmission spectrum, the experimental uncertainties are sufficiently large that is compromises the intended bench marking of the thermal transport models.

Physical Description

18 p.

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INIS; OSTI as DE95008068

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  • 6. international workshop on radiative properties of hot dense matter, Sarasota, FL (United States), 31 Oct - 4 Nov 1994

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  • Other: DE95008068
  • Report No.: UCRL-JC--119309
  • Report No.: CONF-9410314--2
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 29316
  • Archival Resource Key: ark:/67531/metadc677992

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  • January 4, 1995

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Feb. 23, 2016, 3:09 p.m.

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Iglesias, C.A.; Chen, M.H.; McWilliams, D.L.; Nash, J.K. & Rogers, F.J. Observation on radiation transfer experiments using k-shell absorption spectra, article, January 4, 1995; California. (digital.library.unt.edu/ark:/67531/metadc677992/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.