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Probing the spatial coherence of wide X-ray beams with Fresnel mirrors at BL25SU of SPring-8. | LitMetric

Probing the spatial coherence of wide X-ray beams with Fresnel mirrors at BL25SU of SPring-8.

J Synchrotron Radiat

Department of Precision Engineering, School of Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan.

Published: May 2019

AI Article Synopsis

  • Probing spatial coherence of X-rays is crucial for designing advanced optical systems in synchrotron radiation and free-electron lasers.
  • Traditional double-slit experiments face limitations in measuring spatial coherence over large distances due to narrow interference fringe spacing.
  • A new Fresnel-mirror-based optical system was developed to control interference patterns at the SPring-8 facility, allowing for quantitative measurement of coherence related to virtual source size for optimization of beamline optical systems.

Article Abstract

Probing the spatial coherence of X-rays has become increasingly important when designing advanced optical systems for beamlines at synchrotron radiation sources and free-electron lasers. Double-slit experiments at various slit widths are a typical method of quantitatively measuring the spatial coherence over a wide wavelength range including the X-ray region. However, this method cannot be used for the analysis of spatial coherence when the two evaluation points are separated by a large distance of the order of millimetres owing to the extremely narrow spacing between the interference fringes. A Fresnel-mirror-based optical system can produce interference patterns by crossing two beams from two small mirrors separated in the transverse direction to the X-ray beam. The fringe spacing can be controlled via the incidence angles on the mirrors. In this study, a Fresnel-mirror-based optical system was constructed at the soft X-ray beamline (BL25SU) of SPring-8. The relationship between the coherence and size of the virtual source was quantitatively measured at 300 eV in both the vertical and horizontal directions using the beam. The results obtained indicate that this is a valuable method for the optimization of optical systems along beamlines.

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Source
http://dx.doi.org/10.1107/S1600577519002583DOI Listing

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