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Figure 1
(a) Schematic of the double-crystal topography measurement. The asymmetric crystal is Si (220) with an asymmetry angle of 82° which results in a magnification factor of 13.1. The measured lattice plane of the tested bent crystal is also (220). (b) A typical zebra stripe pattern produced by merging stripes at different pitch angles. Each stripe indicates the satisfaction of Bragg's law. The adjacent stripes correspond to a change of 5 arcsec in diffraction angles.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 25| Part 5| September 2018| Pages 1346-1353
https://doi.org/10.1107/S1600577518008056
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