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Figure 13
Closed orbit disturbance during ramp up and down from nominal operating current with (red) and without (blue) corrections. When orbit feedback is included the maximum orbit perturbation is under 5 µm. With minimized orbit perturbations the maximum tune shift is Δνx/Δνy = 0.001/0.002. The squares are the expected orbit perturbation and tuneshifts based on the measured magnetic fields, taking into account the change in the contribution of the earths magnetic field as the iron poles saturate and edge focusing in the undulator.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 32| Part 4| July 2025| Pages 908-918
https://doi.org/10.1107/S1600577525003418
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