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Figure 1
(a) Convergent and (b) divergent beam geometries. Rs = diffractometer radius, Rf = focal length. With the origin at the centre of the disc, the detector moves along the diffractometer circle from (Rs, 0) to (0, −Rs) and the source moves from (0, Rs) to (Rs, 0). Both the source and the detector move such that a source position (x, y) corresponds to a detector position (x, −y).

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 50| Part 5| October 2017| Pages 1331-1340
https://doi.org/10.1107/S160057671701130X
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