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P: Fachverband Plasmaphysik
P 21: Codes and Modeling II
P 21.4: Talk
Friday, March 20, 2026, 10:15–10:30, KH 01.013
Characterising strongly compressed Beryllium using a combined ray tracing and forward-fitting approach — •Hannah Bellenbaum1,2,3 and Tobias Dornheim2,1 — 1Center for Advanced Systems Understanding, Untermarkt 20, 02826 Görlitz, Deutschland — 2Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 DresdenHelmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Deutschland — 3Institut für Physik, Universität Rostock, Albert-Einstein-Str. 23, 18059 Rostock, Deutschland
X-ray Thomson scattering (XRTS) is a commonly used diagnostic in the warm dense matter regime, as it can be used to simultaneously characterise density, temperature and ionisation degree. Extracting these parameters however commonly relies on a forward-modelling approach where a simple model is fitted to experimental data, since the measured spectrum is a convolution of the dynamic structure factor (DSF) describing the plasma conditions and the source-instrument function (SIF) of the detector . This introduces a number of uncertainties and model-dependencies, and fundamentally relies on the model chosen for the SIF. Here, we present a forward-fit using a new open-source XRTS code (xDave) in combination with the ray tracing code HEART to analyse spectra measured for imploding Beryllium capsules at the National Ignition Facility. The coupling of this ray tracing code with a reduced model for the DSF introduces far fewer uncertainties in both the instrument response function and the source spectrum, allowing us accurately study a typical NIF capsule during implosion.
Keywords: X-ray Thomson Scattering; Warm Dense Matter