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Figure 13
Dependence of the flux and the degree of polarization on the FES aperture obtained from simulations for (a) hν1 = 398.6 eV, (b) hν1 = 835.0 eV and (c) hν3 = 2795 eV. The circles indicate the flux, and the triangles indicate the degree of polarization. The solid lines represent the segmented undulator, while the dashed lines show the results for a single 4 m-long APPLE-II undulator (the periodic length: 56 mm, the number of periods: 71). The horizontal axes show the FES aperture normalized by the photon beam size in units of □σ = σx × σy, where σx and σy are the horizontal and vertical beam size at the FES. □σ4m is for the 4 m-long undulator defined as (a) 0.35 mm × 0.30 mm and (b) 0.27 mm × 0.21 mm, whereas □σseg for the segmented undulator as (c) 0.32 mm × 0.21 mm.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 33| Part 1| January 2026| Pages 73-83
https://doi.org/10.1107/S1600577525010641
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