Speaker
Description
To ensure precise control of field quality in normal-conducting accelerator magnets, it is essential to develop models that accurately represent hysteresis during operational cycles. This study focuses on the main magnets of the CERN Super Proton Synchrotron (SPS). We investigate how variations in the current machine's cycles produce different hysteresis patterns in the integral magnetic field and multipoles. A combination of various magnetic measurement systems was employed to evaluate the magnetic field quality, enabling direct observation of history dependence and reproducibility. The results are compared to predictions derived from hysteresis models. The analysis emphasizes the dynamic sextupolar component, distinguishing between rate-dependent effects and quasi-static hysteretic contributions. Furthermore, data sets that incorporate a normalization cycle prior to the machine’s operational cycle are compared with those that do not. This comparison is aimed at assessing the operational advantages vs the drawbacks of pre-cycling quantitatively, in view of stabilizing the sextupolar component and reducing hysteresis-induced variability.
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