Deutsches Elektronen-Synchrotron DESY

Helmholtz-Partner:

- Hereon
- Helmholtz-Zentrum Dresden Rossendorf (HZDR )
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (HZB)

The project SmartPhase is a collaboration of the Helmholtz centers DESY, Hereon, HZDR and HZB. The goal of SmartPhase is to provide users of lensless phase-contrast full-field x-ray microscopy a toolbox to reconstruct their data during an experiment. The reconstruction process is in this case the phase retrieval of the so-called near-field holograms, i.e., the reconstruction of the complex-valued sample information from an intensity-only measurement. The quality of the reconstruction result depends strongly on the choice of the algorithm parameters, the tuning of which can be performed by experts but is often a high barrier for new users. Thus, a main aspect of the development of the SmartPhase toolbox is the self-optimization of the involved parameters. This will be achieved by a combination of optimization of loss functions implemented in pytorch with physical informed neural networks for an online reconstruction.
The online reconstruction is a valuable tool for in situ holographic measurements of multi-material specimen. In general simple reconstruction schemes fail on these samples and complex reconstruction algorithms are inefficient. With this new tool, we want to study the degradation behavior of magnesium wires as potential biodegradable implants. Another research topic is the aging of battery anodes during multiple charging/discharging cycles. Using the online reconstruction provided by the SmartPhase toolbox will allow to inspect the current state of the experiment and carry out adaptions if necessary.

Coordination at DESY:

Deutsches Elektronen-Synchrotron
Dr. Johannes Hagemann
Notkestr. 85
D-22607 Hamburg

Email: johannes.hagemann@desy.de
Phone: +49 40 8998 2489

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