Using pulsed power for hydrodynamic code verification and validation

Summary form only given, as follows. A series of Near Term Liner Experiments (NTLX) was recently, conducted on the Shiva Star capacitor bank at the AFRL. These experiments consisted of an aluminum liner that is magnetically imploded onto a central target by self-induced radial Lorentz forces. The central target consists of an inner Lucite cylinder surrounded by an outer Sn layer. Shock propagation within the Lucite is measured to provide information for hydrodynamic code verification and validation. Target design utilized the adaptive mesh refinement (AMR) Eulerian hydrodynamics code RAGE in 2- and 3D. 1D simulations of the liner driver utilizing the RAVEN MHD code set initial liner/target interaction parameters, which are then used as initial conditions for the RAGE calculations. Both codes utilized standard SESAME equation-of-state data to close the system of equations. At liner/target impact, a convergent shock is generated that drives subsequent hydrodynamics experiments. In concentric targets, cylindrically symmetric shocks will converge on axis, characterizing the symmetry of the liner driver. By shifting the target center away from the liner symmetry axis, variations in shock propagation velocity generate off-center shock convergence. Comparison of experimentally measured and simulated shock trajectories are discussed as are convergence effects associated with cylindrical geometry. Efforts are currently underway to compare equation-of-state effects by utilizing a Gruneisen EOS instead of the original SESAME tables. Further comparisons are made to quasi-analytical solutions in cylindrical geometry [Harlow, F.H. and Amsden, A.A., Fluid Dynamics, Los Alamos National Laboratory Report LA-4700, (1971)] to examine shock acceleration due to radial convergence.