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Figure 5
Spectrometer alignment scans for crystals with r = 50 mm and substrate radius RP = 1000 mm. Crystal wafer material, reflection, Bragg angle and crystal number (when relevant) are given. The scattering angle is 90° for crystal n = 0 in the horizontal plane except for Si(620) where it is 127° (top row). Elastic peaks for different Rowland circle radii (top left); elastic peaks for all five crystals at the optimized Rowland circle radius of 996 mm before (top centre) and after (top right) energy calibration between the crystals. Elastic peaks for different crystal reflections and Bragg angles (bottom row). The increased width of central crystal n = 0 can be attributed to the angular dependence of the elastic scattering that emphasizes the outer radius of the crystal analyzer surface.

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