High Repetition Rate X-ray Fresnel Diffraction Radiography at the Extreme Light Laboratory

We present an overview of the development of our Fresnel Refractive Diffractive Radiography (FDR) platform for the Extreme Light Laboratory (ELL) at the University of Nebraska–Lincoln. This platform couples isochorically heated buried wires with dynamic X-ray phase-contrast imaging of the warm dense matter (WDM) samples 1 . By utilizing novel 1 µm-wide slits, we obtain a highly spatially coherent x-ray source that gives rise to significant refractive and diffractive features from micron-scale density gradients at the interface 2 . Measurement of the evolution of this density profile, driven primarily by the equation of state and thermal conductivity, opens the door for direct measurements of transport properties in WDM 3 . By utilizing a copper tape drive and novel wire extruder we create replenishing solid targets that allow for significantly higher repetition rates than previously demonstrated.