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Figure 4
Typical single-shot spectra of incident XFEL pulses after the Si(111) double-crystal monochromator measured with a high-resolution dispersive spectrometer (Inubushi et al., 2012BB13; Katayama et al., 2016BB16) using an Si(660) flat crystal analyser. The energy resolution is approximately 50 meV. Each dashed line represents the fitted Gauss function, for which the FWHM is indicated. The number of longitudinal modes before the monochromator was approximately 60 (Inubushi et al., 2017BB12).

IUCrJ
Volume 4| Part 6| November 2017| Pages 728-733
ISSN: 2052-2525
https://doi.org/10.1107/S2052252517014014