title: Sagittal focusing of synchrotron radiation X-rays using a winged crystal.
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.
authors: RIKEN Harima Institute SPring-8 Center, Kouto 1-1-1, Sayo, Hyogo, Japan. nisawa@spring8.or.jp
authors: A
authors: A
authors: Nisawa
authors: Y
authors: Y
authors: Yoneda
authors: G
authors: G
authors: Ueno
authors: H
authors: H
authors: Murakami
authors: Y
authors: Y
authors: Okajima
authors: K
authors: K
authors: Yamamoto
authors: Y
authors: Y
authors: Senba
authors: K
authors: K
authors: Uesugi
authors: Y
authors: Y
authors: Tanaka
authors: M
authors: M
authors: Yamamoto
authors: S
authors: S
authors: Goto
authors: T
authors: T
authors: Ishikawa
mesh_terms: D000818:Animals; D003460:Crystallization / Q000295:instrumentation; D004867:Equipment Design; D009113:Muramidase / Q000737:chemistry*; D017356:Synchrotrons; D014961:X-Ray Diffraction / Q000379:methods*
chemical_list: D009113:Muramidase
keywords: SPring-8; crystal bender; double-crystal monochromator; sagittal focusing; two-dimensional focusing; winged crystal