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Figure 2
(a) DuMond diagram with sketched Bragg-condition line (dashed orange line) and diffraction region (yellow strip). The two cyan ovals are examples of an off- and an on-diffraction condition beam, with bandwidth [\Delta\omega] and divergence [\Delta\theta]. The dashed red and blue lines represent examples of angular and energy scans, respectively. The sketch is almost to scale for the (220) diamond reflection in the Bragg condition at 12 keV (see text). (b), (c) Sketches of the crystals, the X-ray beams and X-ray pulses for the off- and on-diffraction conditions, respectively. The converging incident beam comes from the right, has a waist at z = 0 and hits the crystal upstream of the waist. In the off-diffraction case (b), the diverging transmitted beam matches the free-space propagation of the incoming beam after accounting for overall absorption. In the on-diffraction case (c), part of the intensity is redirected to the diffracted beam. Both transmitted and diffracted beams exhibit a substructure in the lateral spatial dimension.

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ISSN: 2053-2733
Volume 74| Part 2| March 2018| Pages 75-87
https://doi.org/10.1107/S2053273318001419
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