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15 October 2012 Diamond double-crystal monochromator at SPring-8
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Abstract
Beam quality of diamond double-crystal monochromator was characterized at undulator beamlines of SPring-8. The <001<-growth (111) IIa diamond crystals were used for high-heat-load double-crystal monochromator. Main issue of IIa diamond monochromator was intensity non-uniformity of reflected beam that was enhanced at the experimental station more than 10 m apart from monochromator. The simple Fresnel diffraction models from segments of the crystal are introduced to explain the origin of non-uniformity. Lattice inclination across growth sector boundary with 0.5 μrad or more, or lattice step due to stacking faults may cause phase shift between segments. The non-uniformity increases up to ~50% using the simple models. We also characterized recently-available <111<-growth crystals at 1-km beamline of SPring-8. The quality is similar to that of previous <001<-growth crystals, regarding rocking curve width for whole region irradiation.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
S. Goto, H. Yamazaki, Y. Shimizu, M. Suzuki, N. Kawamura, M. Mizumaki, M. Yabashi, K. Tamasaku, and T. Ishikawa "Diamond double-crystal monochromator at SPring-8", Proc. SPIE 8502, Advances in X-Ray/EUV Optics and Components VII, 85020A (15 October 2012); https://doi.org/10.1117/12.932287
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