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Figure 10
Intensity profiles produced by circular mirrors set to focus with p = 30 m, q = 10 m, θ = 3 mrad with slope errors from the database entries 3 ([\sigma^{\rm{s}}] = 0.17 µrad), 5 ([\sigma^{\rm{s}}] = 0.85 µrad) and 22 ([\sigma^{\rm{s}}] = 5.32 µrad) at a photon wavelength [\lambda] = 1 Å. The dashed line corresponds to the system without errors, and the solid line used the experimental profile after detrending. The effect of broadening of entry 3 with respect to the others is evident because of its smaller aperture [L\sin\theta_{\rm{g}}]. The Airy disk values [[q1.22\lambda(L\sin\theta_{\rm{g}})^{-1}]] are: 3.45, 0.46 and 0.18 µm for profiles 3, 5 and 22, respectively. Note also that the widths of the intensity profiles for entries 5 and 22 are much smaller than the widths calculated by ray tracing (Fig. 9[link]), indicating that in these cases the effect of beam coherence and diffraction are negligible. This is no longer true for entry 3, where both geometrical optics and physical optics contributions have comparable widths.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 23| Part 3| May 2016| Pages 665-678
doi:10.1107/S1600577516005014
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