Hard X-ray emission and scattering spectrometers for dense plasma studies at MEC, LCLS

X-ray spectroscopy with an ultrabright, tunable XFEL source is a powerful diagnostic for characterization of fundamental properties such as electronic structure, temperature, and density of high energy density plasma. We have built two spectrometers for X-ray emission and scattering studies in the hard X-ray photon energy range between 7 keV and 25 keV. One uses a Highly Annealed Pyrolytic Graphite crystal in von Hamos geometry while the other uses an asymmetric plane of a Quartz crystal in Cauchois geometry. The commissioning experiment utilizes the LCLS hard X-ray FEL beam and the short pulse optical laser system of the MEC instrument to measure resolution performances via emission lines and Compton feature. In this talk, the details of the two spectrometers and preliminary commissioning results will be presented with a discussion of dense plasma conditions.