Measuring Transport Properties in Warm Dense Matter with Fresnel Refractive Diffractive Radiography

Thermal conductivity and particle diffusion play a vital role in several areas of contemporary warm dense matter (WDM) research, including astrophysical and inertial confinement fusion (ICF) systems. However, significant variations in predictions and a scarcity of experimental measurements hamper our understanding. We present an overview of the development of our Fresnel Refractive Diffractive Radiography (FDR) platform for the Omega and NIF laser facilities. This platform couples isochorically heated buried wires with dynamic X-ray phase-contrast imaging. By utilizing novel 1 µm-wide slits, five times smaller than previously demonstrated, 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. Measurement of the evolution of this density profile, driven primarily by particle diffusivity and thermal conductivity, opens the door for direct measurements of transport properties in WDM. We will present successful imaging of dynamic WDM systems at Omega and provide details on future experiments planned for NIF, which will measure the evolution of the interface between CH and liquid D2 samples.

Zoom-Meeting
https://gsi-fair.zoom.us/j/96629963798

Meeting-ID: 966 2996 3798
Kenncode: 130302