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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.


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.

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