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Figure 4
Grating efficiency at the zeroth (m = 0, black/grey), first (m = 1, red/orange) and second (m = 2, blue/azure) orders of diffraction for the low-energy (LE) and high-energy (HE) gratings over the whole FERMI FEL2 wavelength range. The intensity used by the spectrometer is much lower than the total radiation delivered to the users (zeroth order, m = 0) and is slightly lower than the purple dotted lines corresponding to the reflectivity of a single mirror with the same coating and incidence angle as the gratings.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 23| Part 1| January 2016| Pages 98-105
doi:10.1107/S1600577515022080
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