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We describe and characterize a new x-ray optical system in which x rays are steered using multiple reflections within hollow glass capillary tubes. The prototype beam-shaping collector/collimator evaluated for diffraction with CuKα x rays in this letter has throughput of 6% and increases the useful x-ray flux by more than a factor of 4 above that of slit collimation with comparable divergence.

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We have characterized an optical element designed to convert divergent x rays into a quasi-parallel beam. For Cu K radiation, it transmits four times the x-ray power of a slit-based collimation system of comparable energy resolution.