Light element opacities from ATOMIC

J. Colgan*, D. P. Kilcrease, N. H. Magee Jr., G. S. J. Armstrong, J. Abdallah Jr., M. E. Sherrill, C. J. Fontes, H. L. Zhang, P. Hakel

*Corresponding author for this work

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

We present new calculations of local-thermodynamic-equilibrium (LTE) light element opacities from the Los Alamos ATOMIC code. ATOMIC is a multi-purpose code that can generate LTE or non-LTE quantities of interest at various levels of approximation. A program of work is currently underway to compute new LTE opacity data for all elements H through Zn. New opacity tables for H through Ne are complete, and a new Fe opacity table will be available soon. Our calculations, which include fine-structure detail, represent a systematic improvement over previous Los Alamos opacity calculations using the LEDCOP legacy code. Our opacity calculations incorporate atomic structure data computed from the CATS code, which is based on Cowan's atomic structure codes, and photoionization cross section data computed from the Los Alamos ionization code GIPPER. We make use of a new equation-of-state (EOS) model based on the chemical picture. ATOMIC incorporates some physics packages from LEDCOP and also includes additional physical processes, such as improved free-free cross sections and additional scattering mechanisms. In this report, we briefly discuss the physics improvements included in our new opacity calculations and present comparisons of our new opacities with other work for C, O, and Fe at selected conditions.

Original languageEnglish
Pages (from-to)369-374
Number of pages6
JournalHigh Energy Density Physics
Volume9
Issue number2
Early online date18 Mar 2013
DOIs
Publication statusPublished - Jun 2013
Externally publishedYes

Keywords

  • Configuration-interaction
  • Iron
  • Opacities
  • Sun

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics

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    Colgan, J., Kilcrease, D. P., Magee Jr., N. H., Armstrong, G. S. J., Abdallah Jr., J., Sherrill, M. E., Fontes, C. J., Zhang, H. L., & Hakel, P. (2013). Light element opacities from ATOMIC. High Energy Density Physics, 9(2), 369-374. https://doi.org/10.1016/j.hedp.2013.03.001