Mean opacities of LTE plasmas: detailed configuration accounting versus other approaches

Abstract

The hydrodynamic-radiation codes are used for a simulation of mean Rosseland and Planck opacities from different models similar to Hartree-Fock model, average ion model, detailed configuration accounting model, and so on. At present the necessity in such a data is high especially for plasma of mixture of ions. In this work we present the results on a comparison of mean opacities calculated by means of various codes and models. The calculations were carried out for the local thermodynamic equilibrium (LTE) plasmas of various chemical elements and mixtures. The models under consideration are the DESNA model and the THERMOS, JIMENA (analytical opacity formula), and the LEDCOP codes. The main results and conclusions about applicability of each of the approaches based on the comparison are presented for LTE plasma on Be, C, Al, SiO₂. After verification, the results of the DESNA model calculations will be used to create the database on mean opacities in a broad range of plasma density and temperature for various materials, including the case of non-LTE plasma.