Resistive Magnetohydrodynamic Modeling of the Double Cylinder Campaign on the Z-Machine using the Multiphysics Code FLAG

Fusion yields in pulsed-power inertial confinement fusion (ICF) concepts can be degraded by hydrodynamic instabilities that mix liner material into the fuel. To study these high energy density instabilities, the Double Cylinder experimental platform has been developed using the Z-machine at Sandia National Laboratories. On this experimental platform, targets are composed of two concentric beryllium liners and an on-axis metal rod separated by regions of cryogenic deuterium fill. The Z-machine's current drive generates an inward shock in the outer liner that travels through the deuterium fill to the inner liner, which has a pre-imposed defect pattern that launches interacting Richtmyer-Meshkov instability (RMI) modes. The shock and the generated RMI modes converge toward the center rod, where stagnation and reshock occur. In this talk, we describe the effort to use the Los Alamos multiphysics code FLAG to perform fully integrated resistive magnetohydrodynamics modeling of a Double Cylinder experiment that used axisymmetric grooves to generate RMI. We show that the simulation models capture much of the overall early-time physics by comparing synthetic radiographs to experimental ones and simulated liner trajectories to experimentally inferred positions.