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. 2022 Feb 22;29(Pt 2):563–580. doi: 10.1107/S1600577522000601

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© Ke-Jin Zhou et al. 2022

This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.

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Simulated photon flux transmitted through the I21 front-end as a function of energy for three polarizations: linear horizontal (LH), linear vertical (LV) and circular (C). The simulation was done for the existing front-end aperture, which has an angular acceptance of 178 µrad horizontally and 143 µrad vertically. This allows >99% of the beam to pass through at the minimum energy of 250 eV. Circularly polarized light is available up to 1500 eV using the first harmonic. For linearly polarized light, the highest flux is provided by the first harmonic up to around 1200 eV, while the third harmonic provides the highest flux up to 2300 eV. Higher harmonics (up to the 11th harmonic) provide the maximum flux for linearly polarized light up to 3000 eV.