Shockwave Compression of Pre-Compressed H$_{\mathrm{\mathbf{2}}}$\textbf{-He Mixtures}*

We have performed shock compression experiments on pre-compressed H$_{\mathrm{2}}$-He mixtures. Studying pre-compressed samples of H$_{\mathrm{2}}$-He mixtures under dynamic loading allows us to access unique P-T states off of the principal Hugoniot. The understanding of material behavior at these P-T states is crucial to comprehend the origin and evolution of gas planets. Furthermore, the validation of mixture models has been a long-standing topic of interest with numerous conflicting theoretical results, particularly for non-ideal hydrogen systems. In an attempt to get a deeper knowledge in these matters, we have shock compressed mixtures of H$_{\mathrm{2}}$-He. Here, we present our experimental results on the pre-compressed samples of H$_{\mathrm{2}}$-He mixtures using pulsed-power-driven flyer plates at the Z-facility, and impact studies on the two-stage light gas gun.