Separated reactant mix width across diffusion-dominated and hydrodynamically dominated interface mix in inertial confinement fusion implosions

Diffusion-dominated mix in inertial confinement fusion (ICF) is characterized where the majority of the mix occurs in the immediate fuel-shell interface while hydrodynamic-dominated mix pulls shell material from farther away into the central fuel. A thin (150 nm) separated reactants ICF mix platform is highly sensitive to the amount of mix from the first micron of shell-fuel interface. This fine-spatial resolution platform has revealed that material mix in moderate convergence (CR ~ 12) ICF implosions is dominated by a diffusion mechanism. This technique has now been expanded across a set of OMEGA ICF implosions, observing an increase in mix width and mix amount for cooler, slower, and more compressive implosions. Hydrodynamic simulations require a buoyancy-drag mix model to capture the increasing mix width, suggesting a transition between these two mix mechanisms.. Authors: Meaney, K. D. [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)] (ORCID:0000000311427360); Kim, Y. [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)] (ORCID:0000000150020964); Hoffman, N. M. [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)] (ORCID:000000030178767X); Mohamed, Z. L. [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)] (ORCID:0000000170113922); Taitano, W. T. [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)] (ORCID:0000000223690935). DOE Contract: 89233218CNA000001. Subjects: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY