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Figure 3
Photographs of the components of the MAD system using the single-crystal-comb and Soller-collimator blocks which are optimized to filter X-ray beams in the 22–46 keV energy range and photograph of their installation on the goniometer of the D2AM beamline. (a) Distribution of stresses in the single-crystal-comb during its bending (no stresses → many stresses corresponds to dark blue → light blue → green → yellow → orange); stresses are always less than 3 N m−2 (only blue colours) – the hole located under the Si(111) blades of this block has greatly reduced these stresses. (a′) Photograph of this single-crystal-comb cut in a single-crystal block of silicon and generating 50 single-crystal Si(111) blades – see also its hole located under all Si(111) blades. (a′′) This single-crystal-comb is adjusted with a fixing system on a rigid 3D printed support which imposes its LogSpiral curvature generating the orientations of the Si(111) crystal blades with a 0.1° pitch; enlargement of this fixing system. (b) Installation of this small MAD system on the ΘA axis of the D2AM beamline goniometer, with the Soller-collimator block and the 2D photon-counting detector on the corresponding 2ΘA arm; once the energy has been chosen, it is important to place a shielding lead sheet between the single-crystal-comb, the Soller-collimator block and the 2D detector (see the note on the left side of the photograph) in order to protect the filtered beam paths from environmental background noise; this photograph was taken before the installation of this lead shielding sheet.

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