Evaluation of the weighted mean X-ray energy for an imaging system via propagation-based phase-contrast imaging

DOI: 10.3390/jimaging6070063

Authors: Maria Seifert (ECAP, Friedrich-Alexander-Universität Erlangen-Nürnberg) , Mareike Weule (ECAP, Friedrich-Alexander-Universität Erlangen-Nürnberg) , Silvia Cipiccia (Diamond Light Source) , Veronika Ludwig (ECAP, Friedrich-Alexander-Universität Erlangen-Nürnberg) , Thilo Michel (ECAP, Friedrich-Alexander-Universität Erlangen-Nürnberg) , Paul Neumayer (GSI Helmholtzzentrum für Schwerionenforschung GmbH) , Max Schuster (ECAP, Friedrich-Alexander-Universität Erlangen-Nürnberg) , Andreas Wolf (ECAP, Friedrich-Alexander-Universität Erlangen-Nürnberg) , Gisela Anton (ECAP, Friedrich-Alexander-Universität Erlangen-Nürnberg) , Stefan Funk (ECAP, Friedrich-Alexander-Universität Erlangen-Nürnberg) , Bernhard Akstaller (ECAP, Friedrich-Alexander-Universität Erlangen-Nürnberg)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Imaging , VOL 6

State: Published (Approved)
Published: July 2020
Diamond Proposal Number(s): 18540

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.

Journal Keywords: X-ray backlighter spectrum; propagation-based phase-contrast; single-shot X-ray phase-contrast imaging; models and simulations; X-ray generators and sources

Subject Areas: Physics


Instruments: I13-1-Coherence

Documents:
jimaging-06-00063.pdf