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Instruments / Technical Area	Publication Details	Published	Actions
I13-1-Coherence	Single-exposure X-ray phase imaging microscopy with a grating interferometer Andreas Wolf , Bernhard Akstaller , Silvia Cipiccia , Silja Flenner , Johannes Hagemann , Veronika Ludwig , Pascal Meyer , Andreas Schropp , Max Schuster , Maria Seifert , Mareike Weule , Thilo Michel , Gisela Anton , Stefan Funk Journal Of Synchrotron Radiation 29 DOI: 10.1107/S160057752200193X Diamond Proposal Number(s): [18540] Open Access Show Abstract ▼ Abstract: The advent of hard X-ray free-electron lasers enables nanoscopic X-ray imaging with sub-picosecond temporal resolution. X-ray grating interferometry offers a phase-sensitive full-field imaging technique where the phase retrieval can be carried out from a single exposure alone. Thus, the method is attractive for imaging applications at X-ray free-electron lasers where intrinsic pulse-to-pulse fluctuations pose a major challenge. In this work, the single-exposure phase imaging capabilities of grating interferometry are characterized by an implementation at the I13-1 beamline of Diamond Light Source (Oxfordshire, UK). For comparison purposes, propagation-based phase contrast imaging was also performed at the same instrument. The characterization is carried out in terms of the quantitativeness and the contrast-to-noise ratio of the phase reconstructions as well as via the achievable spatial resolution. By using a statistical image reconstruction scheme, previous limitations of grating interferometry regarding the spatial resolution can be mitigated as well as the experimental applicability of the technique.	May 2022
I13-1-Coherence	Evaluation of the weighted mean X-ray energy for an imaging system via propagation-based phase-contrast imaging Maria Seifert , Mareike Weule , Silvia Cipiccia , Veronika Ludwig , Thilo Michel , Paul Neumayer , Max Schuster , Andreas Wolf , Gisela Anton , Stefan Funk , Bernhard Akstaller Journal Of Imaging 6 DOI: 10.3390/jimaging6070063 Diamond Proposal Number(s): [18540] Open Access Show Abstract ▼ Abstract: For imaging events of extremely short duration, like shock waves or explosions, it is necessary to be able to image the object with a single-shot exposure. A suitable setup is given by a laser-induced X-ray source such as the one that can be found at GSI (Helmholtzzentrum für Schwerionenforschung GmbH) in Darmstadt (Society for Heavy Ion Research), Germany. There, it is possible to direct a pulse from the high-energy laser Petawatt High Energy Laser for Heavy Ion eXperiments (PHELIX) on a tungsten wire to generate a picosecond polychromatic X-ray pulse, called backlighter. For grating-based single-shot phase-contrast imaging of shock waves or exploding wires, it is important to know the weighted mean energy of the X-ray spectrum for choosing a suitable setup. In propagation-based phase-contrast imaging the knowledge of the weighted mean energy is necessary to be able to reconstruct quantitative phase images of unknown objects. Hence, we developed a method to evaluate the weighted mean energy of the X-ray backlighter spectrum using propagation-based phase-contrast images. In a first step wave-field simulations are performed to verify the results. Furthermore, our evaluation is cross-checked with monochromatic synchrotron measurements with known energy at Diamond Light Source (DLS, Didcot, UK) for proof of concepts.	Jul 2020

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