X-ray Thomson scattering on compressed Be plasmas*

X-ray Thomson scattering measurements have provided much insight into characterization of dense plasmas such as in determining electron temperature, density, and ionization state [1]. We performed spectrally resolved 6 keV x-ray scattering on laser shock compressed Be plasmas in both the non-collective and collective forward scattering regime at the Omega laser facility. From the forward scattering geometry, we have measured a plasmon peak whose frequency is sensitive to the electron density. We will present first data that indicate a density of n$_{e}$=8$\times $10$^{23}$/cc can be reached for a pressure of 10-15 Mbar. \newline [1] S. H. Glenzer \textit{et al}., Phys. Rev. Lett. \textbf{98}, 065002 (2007); Phys. Rev. Lett. \textbf{90}, 175002 (2003). G. Gregori \textit{et al}., Phys. Plasmas \textbf{11}, 2754 (2004).