Measurements of Sound Velocity and Gr\"{u}neisen Parameter in CH and MgO Shocked to Mbar Pressures

We present sound velocity measurements using an unsteady wave analysis to relate acoustic perturbations in a sample to those in a standard with known sound velocity and Gr\"{u}neisen parameter. The contraction and dilation of perturbations in the shock velocities in each material provide information on the sound velocity. Experiments measured the sound velocity and Gr\"{u}neisen parameter in shocked CH and MgO (periclase) relative to a quartz standard. Hugoniot measurements were also made for MgO shocked to the fluid state; a modified $U_{\mbox{s}} -u_{\mbox{p}} $ relation is presented. The results are compared to \textit{SESAME} and LEOS tables for CH and MgO. This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0001944.