Opacity calculation for aluminum, iron, and gold plasmas using FLYCHK code

• Published in: Journal of quantitative spectroscopy & radiative transfer 2020-12, Vol.257, p.107369, Article 107369
• Main Authors: Cho, M.S., Matsuo, K., Fujioka, S., Hahn, S.J., Cho, B.I., Chung, H.-.K.
• Format: Article
• Language: English
• Subjects: FLYCHK; Opacity; Planck mean opacity; Population kinetics; Rosseland mean opacity
• ISSN: 0022-4073; 1879-1352
• DOI: 10.1016/j.jqsrt.2020.107369

•FLYCHK calculation on Planck and Rosseland mean opacities of Al, Cu, and Au in wide temperature & density ranges is reported.•Comparisons with opacities from PROPACEOS and ATOMIC code provides the validity range of FLYCHK opacity, as well as its limitation.•Correlation of the plasma coupling parameter with opacity, and the sensitivity of LTE and NLTE conditions are reported.•This investigation provide a deeper insight on the opacity related to plasma parameters, and validity of FLYCHK opacity. The opacity information of a finite-temperature plasma is an important property and requires the population distribution of a given plasma condition. A population kinetic code for plasma spectroscopy, FLYCHK, has been widely used by researchers to study the spectroscopic properties of high-energy-density plasmas under a wide range of conditions. In this study, the FLYCHK calculation of the Planck and Rosseland mean opacities of low- to high-Z elements, such as aluminum (Z = 13), iron (Z = 26), and gold (Z = 79), under a wide temperature and density range (T = 10−3–102 keV, ρ = 10−6–102 g/cc) is reported. This study mainly focused on the quantitative comparisons of FLYCHK opacities with commonly used opacities: ATOMIC and PROPACEOS. Comparisons show that the FLYCHK mean opacities are comparable to other results over a wide range of plasma conditions. Aluminum opacities were analyzed in detail to understand the characteristics of FLYCHK opacity simulations.