Abstract

Synchrotron radiation from third generation, high-brilliance rings is an ideal source for X-ray microbeams. The aim of the present article is to discuss properties of bent crystals used as focusing optical elements designed to obtain micron-size photon spots with high intensity and wide bandpass monochromatization. In particular, simple mathematical expressions are derived for the energy bandpass of a strongly demagnifying doubly bent crystal, where the contribution from the sagittal curvature is particularly important.

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