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Figure 10
(Upper plot) Sagitta change of the bimorph mirror when a series of large voltage jumps (−800, −400, 0, 400, 800 V) were sequentially applied to change the curvature at hourly intervals in either open- (blue curve) or closed-loop (green curve). (Lower plots) Zoom in on three regions of the upper plot, all corresponding to the same applied voltage. Closed-loop successfully stabilizes the mirror radius, whereas unpredictable drifts of up to 150 nm occur in open-loop (due to piezo creep and strain from the holder).

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