Detailed spectral line effects on the radiative opacity of laser-produced Al plasmas

The detailed term accounting (DTA) approximation for the line absorption an d the average atom (AA) model for bound-free and free-free absorption are u sed to calculate the radiative opacity of high-power laser-produced plasmas in local thermodynamic equilibrium (LTE). The spectral resolved opacities of Al plasmas are calculated at the temperatures and densities of 40 eV and 0.0135 g/cm(3), and 58 eV and 0.02 g/cm(3). Rosseland and Planck mean opac ities are obtained by integrating the spectral resolved opacities with Ross eland and Planck weighting functions. The results show that the Rosseland m ean opacity is very sensitive to the detailed profile. Radiative opacities under the same plasma conditions are also obtained by using a completely pu re AA model. The results from the DTA and pure AA models are then compared.