Theoretical investigation of the increase in the Rosseland mean opacity for hot dense mixtures.

Based on a detailed configuration accounting model with the term structures treated by the unresolved transition array model, a large scale calculation has been performed for the opacities of medium- and high-Z materials and mixtures. Agreement between our calculated results and previous theoretical simulations is obtained. By filling in the low-opacity regions of one material with the high-opacity regions of other materials, the Rosseland mean opacity of their combination will be increased. This should be of great interest to hohlraum design in indirect-drive inertial confinement fusion. Based on our studies, many mixtures, such as Au+Nd, or Ho+Sn, can result in a similar (or higher) increase in the Rosseland mean as the previously proposed Au +Gd mixture.