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Figure 3
Orientation of a plane mirror/grating pair, in which the inclined grooves are parallel to the surface of the mirror. The plane of incidence for the plane mirror containing the incident and the specularly reflected beam (dashed lines with arrows) is drawn. This plane contains also the diffracted beam from the grating (concluding dashed line with arrow). A vertical rotation axis is proposed to be centered in the incident beam and to be at a distance r from the center of the beam footprint at the grating. The mirror surface and the grooved grating area, which intercepts the center of the reflected beam, are separated by d. The indicated direction for the rotation will lead to increasing photon energy during tuning.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 27| Part 1| January 2020| Pages 25-30
https://doi.org/10.1107/S1600577519014462
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