München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.71: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

Robustness of an X-ray phase-contrast imaging setup for plasma diagnostics at an X-ray backlighter — •Veronika Ludwig¹, Max Schuster¹, Paul Neumayer², Maria Seifert¹, Andreas Wolf¹, Stefan Funk¹, and Gisela Anton¹ — ¹ECAP - Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg — ²GSI Helmholtzzentrum für Schwerionenforschung

Grating-based X-ray phase-contrast imaging demonstrated great potential in medical imaging and materials testing in the last decades. In addition to the conventional attenuation image, a dark-field and a differential phase image are obtained. The differential phase-image enables an enhanced sensitivity to local variations in the electron density distribution. Hence, a further upcoming field of application lies in high-energy-density (HED) physics. Imaging small variations in shocked matter at short length scales and rapid temporal dynamics are very challenging. Here, single-shot imaging with a Talbot interferometer could gain a higher contrast compared to mere attenuation imaging. Experiments regarding the applicability of Talbot imaging were performed with X-rays emitted by a laser-driven backlighter at PHELIX, GSI. Due to the long time between single laser shots on the backlighter wire, no in situ adjustment of the grating interferometer is possible. Thus, a transportable and stable setup, which preserves the exact alignment of the gratings to each other, is necessary. The results obtained with such a setup and the principle of using a moiré map for a beforehand fine adjustment in the home laboratory are presented.