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Phys Rev Lett. 2003 Feb 21;90(7):074801. Epub 2003 Feb 20.

Measurement of the spatial coherence function of undulator radiation using a phase mask.

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  • 1School of Physics, University of Melbourne, Victoria 3010, Australia.


A measurement of the horizontal coherence function of 7.9 keV radiation from an undulator beam line at the Advanced Photon Source is reported. X-ray diffraction from a phase-shifting mask was used, and the coherence function was measured as a function of the width of beam-conditioning slits in the beam line. The coherence distribution is found to be best described by a Lorentzian function.

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