Developing experimental platform to benchmark x-ray fluorescence spectroscopy as a temperature diagnostic for high-energy-density plasmas

Accurate temperature models are critical in modeling planetary interiors and for inertial confinement fusion designs, as temperature affects many important physical properties such as ionization, heat transport, and compressibility. When constructing equation of state (EOS) models for high-energy-density plasmas, temperature measurements add an additional constraint to the more readily available pressure and density data. In this study we present the development of an experimental platform for x-ray fluorescence spectroscopy (XFS) at temperatures of 10s of eV to be used as a temperature diagnostic in EOS experiments. The experiments conducted at the OMEGA laser facility use a buried layer of copper tamped by plastic (CH) on both sides, the two sides are then irradiated by a symmetric laser drive. Simultaneous measurements using XFS and x-ray absorption spectroscopy yield independent measures of the temperature. These initial benchmark results from OMEGA are presented in the development of this x-ray fluorescence platform.