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Figure 9
Long-term stability of the mirror sagitta after applying a large voltage change to the piezo electrodes. For the first ∼11 h, with the mirror operating in open-loop, the sagitta drifted by a few hundred nanometres (blue curve), corresponding to a radius change of ∼100 km. But after activating closed-loop (green curve), the sagitta was quickly stabilized and remained within 0.179 nm r.m.s. over the next ∼9 h.

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