Abstract
Measurements and calculations are presented on the sextupole and decapole components in dipole magnets and the 12-pole and 20-pole components in quadrupoles. The data show a strong current dependence and a characteristic hysteresis behaviour. Good agreement is found with model calculations which are based on eddy currents in the niobium-titanium filaments of the superconducting cable. The influence of these currents on the dipole or quadrupole field has also been studied and is well reproduced by the model. The persistent current effects show an almost logarithmic time dependence which is possibly caused by flux creep in the superconductor. The creep rates vary considerably from magnet to magnet and are quite different for superconductors from different manufacturers.
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