A summary of focusing X ray polycapillary optics is presented including history, theory, modeling, and applications development.\r\nThe focusing effects of polycapillary optics come from the overlap of the beams from thousands of small hollow glass tubes.\r\nModeling efforts accurately describe optics performance to allow for system development in a wide variety of geometries. The\r\nfocusing of X ray beams with polycapillary optics yields high gains in intensity and increased spatial resolution for a variety of\r\nclinical, lab-based, synchrotron or in situ analysis applications.
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