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Figure 6
Black line: beam size (FWHM) as a function of photon energy estimated from the ray-tracing simulated intensity distribution under the assumption that the FEL source is located at the end of the last undulator, with no longitudinal extension. The simulations are performed accounting for the surface error of the mirrors and taking into account the diffraction effects, as described in the text. Red star: beam size from the WFS characterization, taken from the FWHM of the smaller Gaussian contribution to the double Gaussian fit of the 2D intensity distribution [see Figs. 3[link](c) and 4[link](c)]. Blue dots: beam size from the CSD characterization, taken from the FWHM of the smaller Gaussian contribution to the double Gaussian model for the fluence distribution used to fit the CSDs collected as a function of photon energy, see Table 3[link].

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 30| Part 2| March 2023| Pages 457-467
https://doi.org/10.1107/S1600577522012085
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