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Figure 12
In an environment where the temperature varies sinusoidally with an amplitude of ∼0.1°C with a ∼1 h periodicity, the curvature of the mirror in open-loop (blue curve) follows a similar trend (most likely caused by relative thermal expansion between the dissimilar materials of the substrate and its holder). However, once closed-loop is activated (green curve), the mirror shape is instantly stabilized. The inset image shows a zoom of the closed-loop stability (filtered data are a moving average with a window of 101 data points) and a much weaker correlation between temperature and the mirror curvature.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 32| Part 1| January 2025|
https://doi.org/10.1107/S1600577524011007
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