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Enabling time-resolved 2D spatial-coherence measurements using the Fourier-analysis method with an integrated curved-grating beam monitor
Authors
Kai Bagschik
Ralph Buss
+13 more
Stefan Eisebitt
Robert Frömter
Gerhard Grübel
Moritz Hoesch
Leonard Müller
Hans Peter Oepen
Andre Philippi-Kobs
Matthias Riepp
Wojciech Roseker
Michael Schneider
Florian Trinter
Jens Viefhaus
Jochen Wagner
Publication date
1 January 2020
Publisher
Washington, DC : Soc.
Doi
Cite
Abstract
Direct 2D spatial-coherence measurements are increasingly gaining importance at synchrotron beamlines, especially due to present and future upgrades of synchrotron facilities to diffraction-limited storage rings. We present a method to determine the 2D spatial coherence of synchrotron radiation in a direct and particularly simple way by using the Fourier-analysis method in conjunction with curved gratings. Direct photon-beam monitoring provided by a curved grating circumvents the otherwise necessary separate determination of the illuminating intensity distribution required for the Fourier-analysis method. Hence, combining these two methods allows for time-resolved spatial-coherence measurements. As a consequence, spatial-coherence degradation effects caused by beamline optics vibrations, which is one of the key issues of state-of-the-art X-ray imaging and scattering beamlines, can be identified and analyzed. © 2020 Optical Society of America
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