Investigation of the opacity of hot, dense aluminum in the region of its <i>K</i> edge

Davidson, Steven J.; Foster, J. M.; Smith, C.; Warburton, K. A.; Rose, S. J.

doi:10.1063/1.99304

Cited by 146 publications

(74 citation statements)

References 4 publications

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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: 54%

“…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: 85%

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A New Generation of Los Alamos Opacity Tables

Colgan

Kilcrease

Magee

et al. 2016

ApJ

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: 54%

Section: Introductionmentioning

confidence: 85%

A New Generation of Los Alamos Opacity Tables

Colgan

Kilcrease

Magee

et al. 2016

ApJ

201

167

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“…The authors would like to thank all the authors of References [27][28][29][30][31]33,34] for the experimental spectra as well as J. Colgan for providing the ATOMIC spectra.…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…As can be seen in Figure 1 (right), the spectrum can be analyzed taking into account a temperature variation of 6 eV. [27] on HELEN laser facility in the United Kingdom and interpreted by SCO-RCG at T = 37 eV and ρ = 0.01 g/cm 3 . The areal mass is equal to 54 µg/cm 2 .…”

Section: Interpretation Of Experimentsmentioning

confidence: 99%

“…In the experiment by Davidson et al [27], the laser beams were produced by a neodymium-doped glass laser system, HELEN, delivering about 100 J of 1.06 µm radiation in 300 ps, which is converted to about 60 J of 0.53 µm light incident on a target, in each of its two beams. One beam is used to directly irradiate a thin layer of gold (500 Å) producing X-rays that serve as an heating source for an aluminum sample (0.2-0.5 µm).…”

Section: Interpretation Of Experimentsmentioning

confidence: 99%

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Detailed Opacity Calculations for Astrophysical Applications

Pain

Gilleron

Comet

2017

Atoms

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Nowadays, several opacity codes are able to provide data for stellar structure models, but the computed opacities may show significant differences. In this work, we present state-of-the-art precise spectral opacity calculations, illustrated by stellar applications. The essential role of laboratory experiments to check the quality of the computed data is underlined. We review some X-ray and XUV laser and Z-pinch photo-absorption measurements as well as X-ray emission spectroscopy experiments involving hot dense plasmas produced by ultra-high-intensity laser irradiation. The measured spectra are systematically compared with the fine-structure opacity code SCO-RCG. The focus is on iron, due to its crucial role in understanding asteroseismic observations of β Cephei-type and Slowly Pulsating B stars, as well as of the Sun. For instance, in β Cephei-type stars, the iron-group opacity peak excites acoustic modes through the "kappa-mechanism". Particular attention is paid to the higher-than-predicted iron opacity measured at the Sandia Z-machine at solar interior conditions. We discuss some theoretical aspects such as density effects, photo-ionization, autoionization or the "filling-the-gap" effect of highly excited states.

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Opacity

Huebner

Barfield

2014

Astrophysics and Space Science Library

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Investigation of the opacity of hot, dense aluminum in the region of its K edge

Cited by 146 publications

References 4 publications

A New Generation of Los Alamos Opacity Tables

A New Generation of Los Alamos Opacity Tables

Detailed Opacity Calculations for Astrophysical Applications

Opacity

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