Parallel Implementation of ID Radiation Hydrodynamic Code with Inline Atomic Kinetics

Summary form only given. K-shell emission spectroscopy is commonly used to diagnose the core temperature and density of ICF implosions. In addition to providing diagnostic information, mid-Z dopants can also change the implosion dynamics. In order to study the effect of NLTE radiative cooling, we perform implosion calculations of capsules doped with Ar and Kr. Hydrodynamics simulations are performed with the code HELIOS-CR, which includes inline collisional-radiative time-dependent atomic kinetics. Calculations include the effects of bound-bound, bound-free, and free-free contributions to the plasma emission and opacity. In particular, we will address the impact of line radiation cooling on implosion dynamics and demonstrate the effect for characteristic target designs used at Z. At plasma conditions near stagnation, radiative cooling due to Ar K-shell and Kr L-shell emission plays an important role. Accurate accounting for line radiation requires sophisticated atomic models that include a large number of energy levels and transitions. Additionally, radiation heating and cooling rates have to be computed over a wide range of photon energies, and the energy mesh should be fine enough to resolve line transitions. Therefore, computational expense may push the limits of sequential computing. We will present a parallel implementation of the code and provide a scalability study performed on a Linux cluster