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Towards Model-free Temperature Diagnostics of Warm Dense Matter from Multiple Scattering Angles

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arxiv 2411.06830 v1 pith:JOWDSSGC submitted 2024-11-11 physics.plasm-ph astro-ph.IM

Hannah M. Bellenbaum , Benjamin Bachmann , Dominik Kraus , Thomas Gawne , Maximilian P. Böhme , Tilo Döppner , Luke B. Fletcher , Michael J. MacDonald
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Zhandos A. Moldabekov Thomas R. Preston Jan Vorberger Tobias Dornheim
This is my paper · ORCID
classification physics.plasm-phastro-ph.IM
keywords scatteringanglesmodel-freedensediagnosticsmattermeasurementsmultiple
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Warm dense matter (WDM) plays an important role in astrophysical objects and technological applications, but the rigorous diagnostics of corresponding experiments is notoriously difficult. In this work, we present a model-free analysis of x-ray Thomson scattering (XRTS) measurements at multiple scattering angles. Specifically, we analyze scattering data that have been collected for isochorically heated graphite at the Linac Coherent Light Source (LCLS). Overall, we find good consistency in the extracted temperature between small and large scattering angles, whereas possible signatures of non-equilibrium may be hidden by the source function, and by the available dynamic spectral range. The present proof-of-principle study directly points to improved experimental set-ups for equation-of-state measurements and for the model-free study of relaxation times.

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  1. Applying the Liouville-Lanczos Method of Time-Dependent Density-Functional Theory to Warm Dense Matter

    physics.plasm-ph 2025-02 conditional novelty 5.0 of 10

    The Liouville-Lanczos implementation of LR-TDDFT reproduces PAW-LR-TDDFT and path integral Monte Carlo benchmarks for warm dense matter, and accesses high wavenumbers and wide frequency ranges without empty bands.

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