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Figure 9
Spurious reflections of optical light within the optical system of the X-ray imagers. (a) A hexagon-shaped reflection from the iris of the lens is visible when using a YAG screen. (b) The reflection effect disappears changing to an Al-coated YAG screen. Screens can be exchanged within seconds. The images were recorded during beam alignment; the FEL beam is on the left side of each image.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 26| Part 5| September 2019| Pages 1489-1495
https://doi.org/10.1107/S1600577519008737
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