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Evaluation of two methods to minimize the anticlastic curvature of cylindrical bent crystals.
MedLine Citation:
PMID:  18296779     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
A scanning dynamically focusing sagittal X-ray monochromator accepting 3 mrad x 0.1 mrad from a 6 T wiggler has been designed for XAFS measurements. In the energy range 4.1-12.4 keV, the slope error of the second cylindrical crystal caused by anticlastic bending must be less than 1/5 of the Darwin width of the crystal or the photon flux will decrease drastically. Two methods to minimize the anticlastic bending are proposed. Thin crystals with stiffening ribs and thin crystals with an aspect ratio equal to the ;golden value' are evaluated by finite-element analysis and by long-trace-profiler characterization. Both approaches are satisfactory, but the ;golden value' approach is preferred in this case for the second crystal of the new monochromator not only because it is easy to manufacture but also because the surface is smoother than the ribbed crystal.
Authors:
Liangjie Feng; Le Kang; Zhongliang Li; Feixun Zhao; Chaoyin Xu
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Publication Detail:
Type:  Journal Article     Date:  2008-02-19
Journal Detail:
Title:  Journal of synchrotron radiation     Volume:  15     ISSN:  0909-0495     ISO Abbreviation:  J Synchrotron Radiat     Publication Date:  2008 Mar 
Date Detail:
Created Date:  2008-02-25     Completed Date:  2008-05-19     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9888878     Medline TA:  J Synchrotron Radiat     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  140-3     Citation Subset:  -    
Affiliation:
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, People's Republic of China. phoenix@mail.ustc.edu.cn
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