Fig. 6: Fraunhofer diffraction patterns.
From: The Extremely Brilliant Source storage ring of the European Synchrotron Radiation Facility
a Fraunhofer diffraction from a single pair of slits with opening 25 × 25 μm2, measured (Measurement, black line) and calculated (Simulation, red line) at beamline ID10. Primary slits: 0.2 × 0.2 mm2 at 27 m, asymmetrical slits95 at 60 m and detector at 7.8 m from the slits, photon energy: 7.24 keV, detector slits 5 × 5 μm2. The pattern is normalised to the peak value. b Fringe visibility of Fraunhofer diffraction patterns as a function of the horizontal slits’ width (markers: measurements, lines: fit). The horizontal coherence length \({\xi }_{H}\) at 60 m was estimated with \(V={{\exp }}(-{a}^{2}/2{{\xi }_{H}}^{2})\) were \(a\) is the slit aperture96. The estimates for the horizontal coherence length from a Gauss-Schell model97 are \({\xi }_{H}=53.4\) μm at 7.24 keV and \({\xi }_{H}=19.1\) μm at 20.95 keV. The error bars are given by the he standard deviation of the visibility values for each slits setting.
