Abstract
We present here a modeling of Laue crystals in the framework of the ray-tracing program SHADOW (B. Lai and F. Cerrina, Nucl. Instr. and Meth. A 246 (1986) 337 [1]). In this program, the equations of the dynamical theory of X-ray diffraction have been coded to allow calculations of the diffracted intensity distributions. For thin and weakly absorbing crystals these profiles exhibit strong oscillations as a consequence of the Pendellösung effect. These patterns also produce an oscillating value of the integrated intensity as a function of photon energy. The thickness of the crystal can be adjusted to optimize its optical performance for a given energy range. We analyze different examples of thickness optimization for such crystals. The performance of a Laue-Bragg monochromator is then compared to that of a standard Bragg-Bragg monochromator for a beamline configuration.
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