X-ray Thomson scattering from collective electron oscillations in dense beryllium plasmas at the National Ignition Facility*

X-ray Thomson scattering is a widely recognized technique for measuring physical properties and parameters of dense plasmas. In this presentation we show the development of inelastic plasmon scattering in the forward collective scattering geometry to demonstrate first-principles temperature measurements from detailed balance and evaluate the extent of contributions from collisional damping to evaluate electrical conductivity in near-degenerate plasma conditions. Here we resolve the x-ray scattering spectrum from a spectrally narrow, intense laser-produced 9 keV Zn He-alpha x-ray probe on hohlraum-driven compressed beryllium targets with a total laser energy approaching 1 MJ. Importantly, we use a copper backlight filter to reduce the x-ray source bandwidth and deliver a narrow x-ray source to resolve the much smaller plasmon shift compared to Compton scattering.