Speaker
Description
The applicability of the Nonlinear Optics from Off-Energy Closed Orbits (NOECO) method to the SIRIUS storage ring is investigated. Off-energy orbit response matrices (OEORMs) were measured and used for sextupole strength calibration through a Levenberg-Marquardt (LM) fitting procedure with Tikhonov regularization. The fitted strengths reproduced the measured chromaticities with reasonable accuracy and were consistent with control system estimates. Analysis of the OEORM Jacobian revealed strong correlations among sextupole family signatures, indicating significant quasi-degeneracies in the inverse problem. Machine experiments and model-based simulations showed that localized perturbations are redistributed across correlated families, especially in the presence of small optics mismatches. The results indicate that OEORM-based calibration is feasible at SIRIUS, although its resolving power is fundamentally limited by parameter correlations and model imperfections.
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