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Figure 7
(a) Schematic of the MA setup used in the experiments. A spatial energy dispersion is expressed as gradation from red to blue at the sample position, and it is assumed that the energy is uniformly distributed along the whole vertical beam size of ∼16 µm. Thus, the top ray (red) has 35 meV higher energy than that of the center ray (dashed black). Due to a large acceptance of the Montel mirror, it reflects all rays to the analyzer. However, these reflected rays cannot be reflected by an analyzer at once since an analyzer usually has a small acceptance. (b) Conceptual Dumond diagram for a spatially energy-dispersed beam (ellipse) and a crystal reflectivity curve (red area). A spatial energy dispersion manifests as a diagonally shrunk ellipse from a perfect circle, which is for the case of a non-dispersed beam.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 27| Part 4| July 2020| Pages 963-969
https://doi.org/10.1107/S1600577520005792
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