Speaker
Description
The harmonic components of the LHC superconducting magnets exhibit a characteristic decay at low-field, primarily caused by current redistribution within the superconducting cables. This redistribution leads to variations in the multipolar components of the magnetic field, which in turn induce changes in the beam tune and chromaticity. To counteract these effects, a feed-forward compensation system applies predicted corrections during the injection phase, ensuring stable beam conditions. In this work, we employ beam-based measurements to reassess the FiDeL (Field Description of the LHC) magnetic model, which provides parameterizations of the field harmonics as functions of time, current, and magnet history. The goal is to evaluate both the accuracy and reproducibility of the FiDeL-based corrections. The analysis reveals systematic deviations between model predictions and beam observations, indicating limitations in the current implementation.
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