Abstract
We report investigations of the x-ray focusing of a square channel capillary array. We use x rays with an energy of about 1.5 keV from a laser produced plasma. We find the focal structure to be consistent with theoretical expectations. The images were recorded using x-ray film and, to within the precision with which we were able to analyze the results, the data is consistent with an array with negligible channel tilt and a surface roughness of 1.5 nm rms. This is the best performance yet reported for lobster-eye x-ray optics.
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