| Autor: |
Seifert, Maria, Weule, Mareike, Cipiccia, Silvia, Flenner, Silja, Hagemann, Johannes, Ludwig, Veronika, Michel, Thilo, Neumayer, Paul, Schuster, Max, Wolf, Andreas, Anton, Gisela, Funk, Stefan, Akstaller, Bernhard |
| Předmět: |
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| Zdroj: |
Journal of Imaging; Jul2020, Vol. 6 Issue 7, p1-15, 15p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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