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Description
Insertion devices (IDs) of various types provide the photon beams for experiments at the Swiss Light Source 2.0 (SLS 2.0). Adjusting the photon energy or polarization by varying the ID gap or magnet-array configuration, however, introduces orbit distortions that lead to angular and positional shifts of the electron beam and consequently of the photon beam at the beamlines. To compensate these effects, feed-forward (FF) tables are constructed directly from beam-based measurements: the ID-induced orbit changes are corrected using local orbit correctors—one horizontal and one vertical magnet located upstream and downstream of each ID—whose optimal strengths are derived from the local response matrix measurements. Machine studies demonstrate that applying these FF tables significantly suppresses gap-dependent orbit distortions, maintaining the orbit deviation at the level of approximately 1 µm or less across the full range of gap settings and thereby improving photon-beam stability at the beamlines. This work presents the results obtained for the IDs already installed in SLS 2.0, where FF-table correction is currently in routine operation.
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