Interaction of radiation and mix at a hohlraum wall*

In laser-driven hohlraums, mix occurs at the interior wall as it radiates and ablates into foam liners and fill gas. A campaign on the National Ignition Facility, called the Hohlraum Wall Heating campaign, began taking data in 2020 with a platform designed to investigate the interaction of radiation and mix at hohlraum-relevant temperatures and optical depths. The goals of the campaign are two-fold: (1) quantify the effect of mix on radiation transport and (2) measure the mix profile variation with temperature. Initial shots have focused on platform qualification and taking data to optimize simultaneous burn-through and radiography configurations needed to tease out the interdependencies of radiation and mix.  In this talk, we will discuss the modeling efforts used to design the platform and compare initial data with post-shot simulations as part of code-validation efforts.