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Figure 3
Radiography recorded using a high-resolution objective coupled to a fluorescent X-ray screen (YAG:Ce). A collimated, large (700 µm FWHM) attenuated beam was sent through the DPU in its working position (last aperture ∼25 cm upstream of the sample position). The high-resolution screen was positioned ∼7 m after the sample position. For perfectly aligned apertures, a perfect circular shadow is expected. The interferences due to the highly coherent beam are visible. The two circles have a diameter of 500 µm. The distance between the two centres, indicative of the machining tolerances, is 133 µm.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 32| Part 6| November 2025| Pages 1390-1395
https://doi.org/10.1107/S1600577525007945
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