MODELING OF INDIRECT-DRIVE ICF IMPLOSIONS USING 1D HYDRODYNAMICS CODE WITH INLINE COLLISIONAL-RADIATIVE ATOMIC KINETICS

摘要

K-shell emission spectroscopy is commonly used to diagnose the core temperature and density of Ar-doped ICF implosions at OMEGA and Z. To investigate details of spectra formation and energy transport, we perform simulations of Ar-doped indirect laser-driven implosions. We use VisRad, a user-friendly view factor code that simulates the radiation environment in three-dimensional objects, to predict the temperature and radiative flux distributions throughout target components in high-power laser and z-pinch laboratory plasma experiments. Time-dependent hohlraum radiation temperatures and fluxes, computed with VisRad, are used to initialize target implosion simulations with the 1D radiation-hydrodynamics code, HELIOS. This code includes inline collisional-radiative atomic kinetics and multi-angle short-characteristics radiation transport. In particular, we address the impact of Ar line radiation on implosion dynamics. We will also address the importance of time -dependent atomic kinetics for ionization distribution and spectra formation. We discuss details of the calculations and compare our results with experimental data.