NUMERICAL-SIMULATION OF THE EXPLOSION DYNAMICS AND ENERGY-RELEASE FROM HIGH-GAIN ICF TARGETS

Results from numerical simulations are presented describing the explos ion energetics of a high-gain indirect-drive ICF target. The light ion fusion LIBRA-SP target, which consists of an x-ray driven capsule emb edded in a spherical foam-filled hohlraum, is imploded using 12 prepul se and 12 full power Li beams containing a total energy of 8 MJ. Here, we report on the dynamics of the target energy release, focussing in particular on the partitioning of energy between x rays, neutrons, and target debris kinetic energy. Our results indicate that 72% and 22% o f the 552 MJ yield is emitted by the target in the form of neutrons an d x-rays, respectively. Calculated emergent spectra for the target neu trons and x rays are also presented.