Hannover 2020 – wissenschaftliches Programm

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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 4: Poster

K 4.11: Poster

Dienstag, 10. März 2020, 16:30–18:30, f428

Time Resolved X-ray Holography of Cavitation Dynamics at European XFEL — •Hannes P. Hoeppe¹, Malte Vassholz¹, Juan M. Rosselló², Robert Mettin², Johannes Hagemann³, Markus Osterhoff¹, Andreas Schropp³, Christian G. Schroer³, Johannes Möller⁴, Anders Madsen⁴, and Tim Salditt¹ — ¹Institut für Röntgenphysik, Universität Göttingen, Germany — ²3. Phys. Institut, Universität Göttingen, Germany — ³Deutsches Elektronen-Synchrotron, Hamburg, Germany — ⁴European XFEL GmbH, Schenefeld, Germany

High-resolution X-ray Holography with Free Electron Laser radiation enables imaging of fast and ultrafast processes, based on illumination with single X-ray pulses with durations less than 100 fs. We present an investigation of laser-induced Cavitation dynamics in water by X-ray Holography in an optical pump- x-ray probe experimental scheme. Two experiments have been performed in June and October 2019 at the MID Instrument of European XFEL. Cavitation dynamics was studied in three geometries: undisturbed seeding in a flow-through chamber, surface-near seeding and cavitation in a free water jet. We have in particular imaged the fast transition from plasma to vapour, leading to shock wave emission and bubble formation. By iterative phase retrieval or forward modeling, the radial density profiles of early state plasma distribution and cavitation bubbles are obtained. In unique ways, this gives insight to the phase transition and energy balance of the seeding process, as well as volumetric information about the shape and density distribution of later states of the cavitation bubbles.