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Figure 6
Comparison of monochromator operation curves with the normalized `blaze maximum grating efficiency map' for a gold-coated blazed grating with groove density of 150 mm−1. The grey scale refers to zones of equal relative performance for blazed gratings. In the white area more than 75% of the maximum possible diffraction efficiency is achieved, while in the dark grey areas the relative performance is less than 25% of maximum performance. In the lighter grey area >50% is provided, while in the darker grey areas at least >25% is available. The solid red and the dashed blue line refer to the `fixed focus' operation according to (10)[link] with the two constants cff = 1.245 and cff = 1.79. The dashed black line refers to the operation at blaze maximum according to (8)[link] for the chosen blaze angle of γ = 0.22°. At the borders of the light red areas the diffraction efficiency of the chosen blazed grating will have decayed to about 50% of the maximum.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 26| Part 4| July 2019| Pages 1181-1191
https://doi.org/10.1107/S1600577519004120
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