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Acta Crystallogr A. 2013 Jan;69(Pt 1):91-7. doi: 10.1107/S0108767312044601. Epub 2012 Nov 30.

Bent perfect crystals as X-ray focusing polychromators in symmetric Laue geometry.

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  • 1European Synchrotron Radiation Facility, Grenoble, France. guigay@esrf.fr

Abstract

The focusing properties of cylindrically bent crystals in symmetric Laue geometry are discussed using the formalism of Fresnel diffraction and the analytical solution of the Takagi-Taupin equations for a point source on the entrance surface. The existence of a focal shift in the dynamical focusing effect is pointed out and discussed. The present theoretical framework is applied to experiments performed at the energy-dispersive X-ray absorption spectroscopy beamline of the European Synchrotron Radiation Facility concerning the position and the size of the focal spot obtained from a polychromatic source at a large distance from the bent crystal.

PMID:
23250065
[PubMed]
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