XAFS+SOP experiments provide a pathway towards thermal conductivity measurements at HED conditions*

Directly measuring temperature as well as thermal conductivity at HED conditions is challenging. At the Laboratory for Laser Energetics (LLE), a Streaked Optical Pyrometer (SOP) measures the self-emission of heated samples above 3600 K and the X-ray Absorption Fine Structure (XAFS) spectroscopy platform measures simultaneous temperature, density and pressure. SOP and XAFS data of the Fe K-edge were collected at two times, 10 ns apart, within in a constant pressure hold and a clear temperature increase was observed. This data is used to estimate the thermal conductivity of Fe near 200 GPa.