Browsing by Author "Afshar, J"

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    High speed free-run ptychography at the Australian Synchrotron
    (Australian Nuclear Science and Technology Organisation, 2021-11-26) Kewish, CM; Jones, MWM; van Rissen, GA; Phillips, NW; Hinsley, GN; Schrank, CE; Afshar, J; Reinhardt, J; de Jonge, MA
    The Australian Synchrotron X-ray Fluorescence Microscopy (XFM) beamline has recently implemented fast scanning ptychography, a scanning X-ray diffraction microscopy method. Ptychography creates super-resolution images from transmitted microdiffraction patterns acquired as the sample is scanned through the beam. Highspeed detectors and high-performance computers are required to iteratively reconstruct these complex images. The experimental methods and reconstruction algorithms have significantly evolved over the last decade and a half into a mature and user-friendly complementary imaging method to XFM. Here we present the implementation of high speed ptychography at the XFM beamline, which includes a free run data collection mode where detector dead time is eliminated, and the scan time is optimized. We show that free-run data collection is viable for fast and high-quality ptychography by demonstrating extremely high data rate acquisition covering areas up to 352,000 μm2 at up to 140 μm2/s, with 18× spatial resolution enhancement compared to the beam size. With these improvements, ptychography at velocities up to 250 μm/s is approaching speeds compatible with fast-scanning X-ray fluorescence microscopy. The combination of these methods provides morphological context for elemental and chemical information, enabling unique scientific outcomes. © The Authors