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Bent perfect crystals as X-ray focusing polychromators in symmetric Laue geometry
J P Guigay1, C Ferrero, D Bhattacharyya
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.
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