Optimization of X-ray energy resolution from a horizontally focused single-crystal monochromator

被引:1
作者
Lidestri, Joseph P. [1 ]
Hendrickson, Wayne A. [1 ]
机构
[1] Columbia Univ, Howard Hughes Med Inst, Dept Biochem & Mol Biophys, New York, NY 10032 USA
关键词
Synchrotron Radiation; Si(111) crystal; Protein crystallography; Multi-wavelength anomalous diffraction; (MAD); SYNCHROTRON-RADIATION; CUT CRYSTALS; DIFFRACTION;
D O I
10.1016/j.nima.2008.11.009
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
A method has been developed to optimize the energy resolution of a horizontally focusing monochromator. The method consists of determining the optimum radius of curvature of the cylindrically bent monochromator crystal by minimizing the total diffracted X-ray flux measured through an X-ray absorption foil. When measured at an absorption edge a global minimum can be identified, which corresponds to the minimum energy band accepted along the entire length of the crystal. Experimental verification of this method has been validated by comparing X-ray fluorescent scans taken for a series of crystal curvatures and by directly measuring the X-ray beam profiles at the corresponding points. The actual optical configuration and asymmetric-cut parameter of the focusing monochromator on beamline X4C at the National Synchrotron Light Source are modeled and ray tracing simulations of the optical system are compared with direct beam profile measurements. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:289 / 300
页数:12
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