Abstract

One question of particular interest in the measurement of x-ray imaging optics for space telescopes concerns the characteristics of the point spread function (PSF) in orbit and the focal length for an infinite source distance. In order to measure such a PSF, a parallel x-ray beam with a diameter of several centimeters to meters is required. For this purpose a large area transmission x-ray zone plate (ZP) for collimating x-ray beams has been designed, built, and tested. Furthermore we present a setup to determine large-scale aberrations of the collimated beam. From x-ray measurements we obtain an upper limit for the angular resolution of ±0.2 arc sec and a first-order diffraction efficiency of 13%. These results show that it is possible to use a ZP as a collimator for the PANTER x-ray test facility.

© 2015 Optical Society of America

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