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Figure 3
(a) The hard X-ray photon energy control system at the PAL-XFEL and (b) a schematic illustration of its operation. The optimization and interpolation of the diamond crystal angle were accomplished within the range ΔE/E ≃ 2% centered at 11.220 keV. Given the target photon energy λ, the red dashed box changes the electron bunch energy accordingly (V, I1, I2) and the calculated diamond crystal angle θ is compensated from the calibration table in the blue dashed box. The green line indicates the electron beam path and the purple line shows the self-seeded beam path to the XSS hutch. (c) The system was demonstrated with the von Hamos spectrometer by recording elastic scattering signals from 11.221 to 11.225 keV with an energy step of 1 eV. Each signal is fitted with a Gaussian curve.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 30| Part 6| November 2023| Pages 1038-1047
https://doi.org/10.1107/S1600577523007312
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