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- Title
Sagittal focusing of synchrotron radiation X-rays using a winged crystal.
- Authors
Nisawa, A.; Yoneda, Y.; Ueno, G.; Murakami, H.; Okajima, Y.; Yamamoto, K.; Senba, Y.; Uesugi, K.; Tanaka, Y.; Yamamoto, M.; Goto, S.; Ishikawa, T.
- Abstract
A Si(111) winged crystal has been designed to minimize anticlastic bending and improve sagittal focusing efficiency. The crystal was thin with wide stiffening wings. The length-to-width ratio of the crystal was optimized by finite element analysis, and the optimal value was larger than the `golden value'. The analysis showed that the slope error owing to anticlastic bending is less than the Darwin width. The X-rays were focused two-dimensionally using the crystal and a tangentially bent mirror. The observed profiles of the focal spot agreed well with the results of a ray-tracing calculation in the energy range from 8 to 17.5 keV. X-ray diffraction measurements with a high signal-to-noise ratio using this focusing system were demonstrated for a small protein crystal.
- Subjects
SYNCHROTRON radiation; X-ray diffraction; FINITE element method; MONOCHROMATORS; SIGNAL-to-noise ratio; CRYSTALLOGRAPHY
- Publication
Journal of Synchrotron Radiation, 2013, Vol 20, Issue 2, p219
- ISSN
0909-0495
- Publication type
Article
- DOI
10.1107/S0909049512049813