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Figure 2
Ray-tracing diagram for a short-working-distance dispersive X-ray spectrometer. Two Rowland circles are constructed through the source point; flat analyser crystals with their endpoints on these circles can be tilted so that they all select the same range of Bragg angles. It then follows (see Fig. 1[link]) that the virtual sources for reflection from the crystals all lie on a third, larger circle (dashed), and that an aperture placed on this circle will select photons in the desired energy range. In this case the position-sensitive detector was located to allow clearance for a 5.6 cm-diameter diamond anvil cell (DAC), and the average diameter of the Rowland circles was approximately 7.4 cm, leaving clearance for a mounting bracket and translation stages (not shown) underneath the crystals.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 19| Part 2| January 2012| Pages 245-251
doi:10.1107/S0909049511056081
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