Hannover 2020 – wissenschaftliches Programm

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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 1: New Methods - Detonic - Light sources (EUV and others)

K 1.5: Vortrag

Montag, 9. März 2020, 15:30–15:45, f428

Pump-Probe High-Resolution X-Ray Holography of Cavitation Dynamics at the European XFEL — •Malte Vassholz¹, Hannes P. Hoeppe¹, 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

Cavitation phenomena play an important role in technology, sonochemistry and medicine. X-ray holography at free electron lasers provides a unique tool to study cavitation dynamics with 10-100fs resolution in time and below optical resolution in space. In addition, with X-rays it is possible to observe the density distribution inside the cavitation bubble, which is inaccessible for observation with optical light. Hence, X-rays can make the dynamics of the process of nucleation and formation of cavitation bubbles visible, helping to understand and model cavitation dynamics. We performed an X-ray holography experiment at the MID beamline of the European XFEL. An infrared ns laser pump drove the cavitation process, whereas the X-ray laser probed the dynamics. By forward modeling and iterative phase retrieval, the X-ray holograms yield the density and pressure distributions of the cavitation bubbles in space and time. The experiment provides an insight in the dynamics of single individual cavitation bubbles up to statistics of more than 10000 individually probed events.