Investigating hydrodynamic instabilities in high energy density systems on the Z Machine

We present experimental data for two platforms investigating the Richtmyer-Mehskov process and interfacial feedthrough on the Z Machine at Sandia National Laboratories. Cylindrical liners filled with liquid deuterium are magnetically imploded with \textgreater 20 MA of current, driving a converging shock that propagates towards the central axis and generating a high plasma-beta system suitable for investigating HED hydrodynamical processes. The first platform investigates the interaction of this shock with a solid beryllium rod machined with sinusoidal perturbations that grow due to the Richtmyer-Meshkov process. The second platform replaces the on-axis rod with a cylindrical liner, enabling investigation of the feedthrough of these instabilities to the inner liner surface. Finally, future experimental platforms presently under development will be discussed, including (1) a variant where the outer cylindrical liner~is~replaced with a~quasi-spherical liner to drive strong converging shocks that interact with a nested spherical target, enabling the investigation of Bell-Plesset effects, and (2) an exploding cylindrical liner system to study the Rayleigh-Taylor instability driven for \textgreater 100 ns to a highly nonlinear regime. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525 and LANL is managed and operated by Triad National Security under DOE NNSA contract 89233218CNA000001