SKM 2023 – wissenschaftliches Programm
DY 18.7: Vortrag
Dienstag, 28. März 2023, 11:45–12:00, ZEU 148
X-ray imaging of the sonoluminescent cavitation bubble collapse with single XFEL pulses — •Hannes Paul Hoeppe1, Atiyeh Aghelmaleki2, Juan Manuel Rosselló3, Malte Vassholz1, Markus Osterhoff1, Daniel Schwarz4, Johannes Hagemann4, Robert Mettin2, Anders Madsen5, and Tim Salditt1 — 1Institute for X-ray Physics, Georg-August-University, Göttingen, Germany — 2Third Institute of Physics, Georg-August-University, Göttingen, Germany — 3Faculty of Mechanical Engineering, University of Ljubljana, Ljubljana, Slovenia — 4Center for X-ray and Nano Science, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 5European X-Ray Free-Electron Laser Facility, Schenefeld, Germany
We study the dynamics and in particular the collapse of a single cavitation bubble in water. A cavitation bubble is trapped and driven by an ultrasonic field leading to nonlinear radial oscillations. During its periodic collapses, extreme pressure and temperature is reached which can lead to the formation of a plasma core and the emission of light. The fast evolving pressure, density and temperature distribution and the shape of the bubble during its collapse has so far only been accessible by simulations. Full-field X-ray phase contrast imaging provides quantitative information of the density distribution of the sample. Implemented at X-ray free-electron lasers, this enables the investigation of fast processes and extreme states of matter with a unique contrast. We present the evolution of the bubble's density profile during the sonoluminescent collapse and the current state of analysis.