High speed free-run ptychography at the Australian Synchrotron
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Date
2021-11-26
Journal Title
Journal ISSN
Volume Title
Publisher
Australian Nuclear Science and Technology Organisation
Abstract
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
Description
Keywords
ANSTO, Australian organizations, X-ray fluorescence analysis, Images, Algorithms, Beams, Spatial resolution, X-ray diffraction
Citation
Kewish, C., Jones, M., van Riessen, G., Phillips, N., Hinsley, G., Schrank, C., Afshar, N., Reinhardt, J., & de Jonge, M. (2021). High speed free-run ptychography at the Australian Synchrotron. Presentation to the ANSTO User Meeting, 24-26 November 2021, Online. Retrieved from: https://events01.synchrotron.org.au/event/146/contributions/4318/contribution.pdf