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Figure 3
Results of the wave optics simulation of the intensity versus electron energy spread calculated for the ID06 U18 undulator. The radiation is calculated at the far field [(a) and (b)] and backpropagated to the center of the undulator [(c) and (d)]. (a) Intensity map at the far field as a function of [\delta_{{\cal E}}] calculated at the first harmonic (10 keV). (b) Values of the angular-width correction (normalized to the width at zero energy dispersion) as a function of the electron energy spread. The widths are measured by the FWHM and the SD value (2.355 × r.m.s.) of the far-field intensity profiles [as shown in (a) for n = 1]. They are compared with Qa. (c) The same as (a) but for the backpropagated radiation. (d) The same as (b) but for the size corrections compared with Qs.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 32| Part 2| March 2025| Pages 340-354
https://doi.org/10.1107/S1600577525000190
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