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Probing ultrafast foam homogenization with grating-based X-ray dark-field imaging.

Leonard Wegert1, Constantin Rauch2, Stephan Schreiner2

  • 1Plasma Physics Department, GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291, Darmstadt, Germany. l.wegert@gsi.de.

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|November 26, 2025
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Summary

Grating-based X-ray dark-field imaging reveals microstructural changes in laser-heated foam targets. This advanced technique overcomes limitations of conventional radiography for studying materials under extreme conditions.

Keywords:
Foam homogenizationGrating-based phase-contrastHydrodynamic simulationsInertial confinement fusionLasersX-ray dark-field imaging

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Area of Science:

  • Materials Science
  • Physics
  • Imaging Technology

Background:

  • Microstructured foams are crucial for applications like laser-driven particle acceleration and inertial confinement fusion.
  • Understanding foam microstructure under extreme conditions is essential for optimizing target performance.
  • Conventional radiography lacks the resolution to observe microstructural changes in chemically produced foam targets.

Purpose of the Study:

  • To investigate microstructural changes in foam targets subjected to rapid heating by laser-accelerated protons.
  • To evaluate the effectiveness of grating-based X-ray dark-field imaging for observing these changes.
  • To compare experimental results with simulations for validation.

Main Methods:

  • Utilized grating-based X-ray dark-field imaging to probe foam targets.
  • Subjected foam samples to rapid heating using laser-accelerated proton pulses.
  • Performed hydrodynamic simulations of a simplified foam model to generate synthetic dark-field data for comparison.

Main Results:

  • Demonstrated the capability of grating-based X-ray dark-field imaging to visualize microstructural alterations in foam targets.
  • Observed significant structural changes in foams under laser-induced heating.
  • Found good agreement between experimental dark-field imaging data and simulation results.

Conclusions:

  • Grating-based X-ray dark-field imaging is a viable technique for observing microstructural evolution in foam targets under extreme conditions.
  • This imaging method overcomes the resolution limitations of conventional radiography for chemically produced foams.
  • The study validates the use of this technique for advancing research in laser-plasma interactions and fusion energy.