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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 9: Microscopy and Tomography with X-ray Photons, Electrons, Ions and Positron

KFM 9.11: Talk

Wednesday, March 29, 2023, 12:35–12:55, POT 106

Start-to-end simulations of partially coherent X-ray imaging experiments at synchrotron beamlines — •Martin Seyrich — Deutsches Elektronen-Synchrotron DESY, Centre for X-ray and Nano Sciece CXNS, Hamburg, Germany

In the last decade, coherent X-ray imaging techniques, such as ptychography and holography, have grown a large user base at third and fourth generation X-ray light sources. In contrast to conventional microscopy techniques, coherent imaging techniques do not directly project an image on a detector. Instead, the image of the object is retrieved algorithmically from interference patterns, usually under the assumption of a fully coherent illumination.

Real X-ray sources are not perfectly coherent, they can be simulated as stochastic sources emitting an ensemble of waves. These waves can be propagated from the source through the entire beamline ending at the detector. The simulated interference patterns can then be treated with the same phase retrieval algorithms as experimental data.

Here, we present our extensions to existing established simulation software (OASYS / SRW) that permit the user to perform such start-to-end simulations with relative ease. We will present simulated data sets of ptychographic and holographic experiments, and discuss the computational demands of such simulations.