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Opacity calculations for aluminum, hydrogen, and gold using FLYCHK with improved free-free opacity formalismOpacity calculations for aluminum, hydrogen, and gold using FLYCHK with improved free-free opacity formalism
- Authors
- Sohn, J.H.; Cho, M.S.; Chung, H.-K.; Cho, B.I.; Hahn, Sang June
- Issue Date
- Jul-2023
- Publisher
- Elsevier B.V.
- Keywords
- FLYCHK; Free-free opacity; Mean opacity; Opacity
- Citation
- Current Applied Physics, v.51, pp 53 - 63
- Pages
- 11
- Journal Title
- Current Applied Physics
- Volume
- 51
- Start Page
- 53
- End Page
- 63
- ISSN
- 1567-1739
1878-1675
- Abstract
- Opacity is an essential property for understanding the fundamental properties of high-energy-density (HED) and astrophysical plasmas. FLYCHK, a collisional-radiative code, has been used to calculate the opacities of HED plasmas under various conditions because of its simplicity and availability. However, the opacity calculations of FLYCHK have limitations in a strongly coupled region, partly because of the problem of a free-free opacity formalism. In this study, we improved the free-free opacity calculation model of FLYCHK and generated opacities of various materials, including high-Z materials (Al, H, and Au). The FLYCHK opacities were in good agreement over a wide range of conditions with those obtained using the Los Alamos opacity code ATOMIC and the detailed level accounting model. © 2023 Korean Physical Society
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