Light element opacities of astrophysical interest from ATOMIC

Colgan, J.; Kilcrease, D. P.; Magee, N. H.; Armstrong, Gregory; Abdallah, J.; Sherrill, M. E.; Fontes, C. J.; Zhang, H. L.; Hakel, P.

doi:10.1063/1.4815837

Cited by 8 publications

(25 citation statements)

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“…For example, in Colgan et al (2015) we compared monochromatic opacities of Al and Fe with various measurements performed in the 1990s (Davidson et al 1988;Perry et al 1991;Springer et al 1992;Winhart et al 1996). Overall, good agreement was found with these measurements.…”

Section: Single-element Opacity Comparisonsmentioning

confidence: 51%

“…Several previous publications (Colgan et al 2013a(Colgan et al , 2013b have described a few aspects of our ATOMIC calculations, including comparisons of the monochromatic opacity against several sets of opacity measurements made in the 1990s (Davidson et al 1988;Perry et al 1991;Springer et al 1992;Winhart et al 1996). In this paper we also discuss comparisons of our opacity calculations against the opacity measurements made using the Sandia National Laboratory Z-pinch machine (Bailey et al 2007(Bailey et al , 2015.…”

Section: Introductionmentioning

confidence: 83%

“…Overall, good agreement was found with these measurements. We have also compared Rosseland mean opacities for the elements H and He (Colgan et al 2013a), and C and O (Colgan et al 2013b), with OP and OPAL data. Again, overall reasonable, although not perfect, agreement was found between the ATOMIC calculations and other opacity efforts.…”

Section: Single-element Opacity Comparisonsmentioning

confidence: 99%

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A New Generation of Los Alamos Opacity Tables

Colgan

Kilcrease

Magee

et al. 2016

ApJ

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201

167

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We present a new, publicly available set of Los Alamos OPLIB opacity tables for the elements hydrogen through zinc. Our tables are computed using the Los Alamos ATOMIC opacity and plasma modeling code, and make use of atomic structure calculations that use fine-structure detail for all the elements considered. Our equation of state model, known as ChemEOS, is based on the minimization of free energy in a chemical picture and appears to be a reasonable and robust approach to determining atomic state populations over a wide range of temperatures and densities. In this paper we discuss in detail the calculations that we have performed for the 30 elements considered, and present some comparisons of our monochromatic opacities with measurements and other opacity codes. We also use our new opacity tables in solar modeling calculations and compare and contrast such modeling with previous work.

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Section: Single-element Opacity Comparisonsmentioning

confidence: 51%

Section: Introductionmentioning

confidence: 83%

Section: Single-element Opacity Comparisonsmentioning

confidence: 99%

See 1 more Smart Citation

A New Generation of Los Alamos Opacity Tables

Colgan

Kilcrease

Magee

et al. 2016

ApJ

Self Cite

201

167

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“…So the present results were finally compared with the OPLIB opacity database using the ATOMIC code. The ATOMIC opacity code has been developed intentionally for generating averaged opacities such as the Rosseland mean opacity or the Planck mean opacity, and has been applied extensively in astrophysics and ICF studies as well (Fontes et al 2006;Hakel et al 2006;Colgan et al 2013aColgan et al , 2013bHakel et al 2014;Fontes et al 2015). The ATOMIC calculations are detailed enough in comparison with the experimental data.…”

Section: Discussionmentioning

confidence: 99%

“…Later on, the DCA method was much improved with a new detailed term accounting (DTA) OPLIB database, with the opacity tables generated by the LEDCOP code (Magee et al 1995). More recently, the data produced by the newest ATOMIC code (Colgan et al 2013b;Fontes et al 2015) have been released in the OPLIB database. 4 Lawrence Livermore National Laboratory (LLNL) has developed a stellar opacity model using the DTA method called OPAL (Rogers & Iglesias 1992).…”

Section: Introductionmentioning

confidence: 99%

Opacity Measurement and Theoretical Investigation of Hot Silicon Plasma

Xiong

Yang

Zhang

et al. 2015

ApJ

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We report on opacity measurements of a silicon (Si) plasma at a temperature of (72 ± 5) eV and a density of (6.0 ± 1.2) mg cm −3 in the photon energy range of 1790-1880 eV. A 23 μg cm −2 Si foil tamped by 50 μg cm −2 CH layers on each side was heated to a hot-dense plasma state by X-ray radiation emitted from a D-shaped gold cavity that was irradiated by intense lasers. Absorption lines of 1s − 2p transitions of Si XIII to Si IX ions have been measured using point-projection spectroscopy. The transmission spectrum of the silicon plasma was determined by comparing the light passing through the plasma to the light from the same shot passing by the plasma. The density of the Si plasma was determined experimentally by side-on radiography and the temperature was estimated from the radiation flux data. Radiative hydrodynamic simulations were performed to obtain the temporal evolutions of the density and temperature of the Si plasma. The experimentally obtained transmission spectra of the Si sample plasma have been reproduced using a detailed term account model with the local thermodynamic equilibrium approximation. The energy levels, oscillator strengths and photoionization cross-sections used in the calculation were generated by the flexible atomic code. The experimental transmission spectrum was compared with the theoretical calculation and good agreement was found. The present experimental spectrum and theoretical calculation were also compared with the new opacities available in the Los Alamos OPLIB database.

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