München 2019 – wissenschaftliches Programm
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 9: Poster
K 9.5: Poster
Donnerstag, 21. März 2019, 16:30–18:30, Durchgangshalle
Cavitation Dynamics Studied by Time-Resolved High-Resolution X-Ray Holography at European XFEL — •Hannes P. Hoeppe1, Juan M. Rosello2, Malte Vassholz1, Thomas M. Kurz2, Robert Mettin2, Johannes Hagemann1, Markus Osterhoff1, Christian G. Schroer3, Andreas Schropp3, and Tim Salditt1 — 1Institut für Röntgenphysik, Universität Göttingen, Germany — 23. Phys. Institut, Universität Göttingen, Germany — 3Deutsches Elektronen-Synchrotron, Hamburg, Germany
Cavitation dynamics are of great interest, since they are held responsible for erosion and are important for ultrasonic cleaning, sonochemistry and medicine. The compression of bubbles can lead to a violent collapse with extreme states of heat and pressure. In this state the bubble radius is at sub-micron scale with temporal changes in sub-ns regime. This state of cavitation has not been resolved yet, as it brings the optical observation methods to its limits. X-ray holography with single free-electron-laser pulses overcomes these limits and is therefore the optimal method for the investigation of extreme states of cavitation.
This contribution describes a time-resolved high-resolution x-ray holography experiment to study cavitation dynamics, scheduled in June 2019 at the European XFEL. The experiment aims to image spatially and temporally the extreme states of bubble formation in water during their collapse. Cavitation is induced by a short laser pulse and enhanced by ultrasonic fields. The bubble collapse is imaged with near-field holography by fs-FEL pulses. We will present the current state of preparation and first results from in-house experiments.