Open AccessSagittal focusing of synchrotron radiation X‐rays using a winged crystal
Author(s) -
Nisawa A.,
Yoneda Y.,
Ueno G.,
Murakami H.,
Okajima Y.,
Yamamoto K.,
Senba Y.,
Uesugi K.,
Tanaka Y.,
Yamamoto M.,
Goto S.,
Ishikawa T.
Publication year - 2013
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049512049813
Subject(s) - crystal (programming language) , bent molecular geometry , optics , ray tracing (physics) , bending , synchrotron radiation , diffraction , stiffening , physics , materials science , radiation , perfect crystal , computer science , composite material , thermodynamics , programming language
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.