Uncertainty Quantification using Two-Shock Campaign data and simulations

The 2-shock campaign$^1$ was a series of NIF capsule implosions that used a 675 micron outer radius capsule with a roughly 175 micron thick 1-{\%} Si-doped ablator. These capsules were used to test several hypotheses for yield degradation, including: shock convergence mis-timing, enhanced surface roughness, implosion asymmetry, and increases to the convergence ratio (initial to final inner radius ratio). We use the xRAGE Eulerian Adaptive-Mesh-Refinement computer code to model these implosions in 1-D and 2-D. We start by comparing our results to DD, DT, and TT yields, along with the DT/TT ratio, burn weighted DT Tion value, x-ray hot spot size and burn width. We use normalized differences between the simulation and experiment for these quantities and compare these results to those derived from measurement uncertainties. These comparisons show that 2-D simulations better match the data than 1-D simulations, but there is room for improvement for some gas filled capsules and capsules where the convergence ratio is great than 15.

$^1$G.A. Kyrala et al. Phys. Plasmas, 25, 102702 (2018)