Characterization of x-ray optic performance

This paper reports the characterization of a high-efficiency polycapillary lens designed for microanalysis from a point source. The lens is unique in that it has been optimized for use over a broad energy range from 8 keV (Cu &) to 17.5 keV (MO I&). A n x-ray optical bench, which provides both high resolution imaging and energy resolving capabilities, was used to test the lens. Images of the focusing characteristics and transmission quality of the lens were obtained using a magnifying x-ray camera, and the focal-spot size and overall convergence were determined from these images. The focal spot size was also measured using a knife-edge technique, and the results compared with those obtained using the CCD camera. Measurements of the x-ray intensity with and without the lens were used to determine the x-ray flux gain at various energies.