Abstract
We carried out electromagnetic field analyses on the shielding-current-induced field (SCIF) of a cosine–theta dipole magnet, which is wound with coated conductors with finite electric field ( E )–current density ( J ) characteristics and must ramp up its magnetic field. E – J characteristics, which depend on the field amplitude and orientation, were formulated based on the measured E – J data and were used for the analyses. The distributions of E in coated conductors of the magnet during the ramp-up phase as well as the flat top of the magnet excitation was revealed, and the relevant range of E – J characteristics of coated conductors was discussed from the viewpoint of dominating shielding currents. The influences of the variation of the E – J characteristic and the field ramp-up rate on SCIF were examined.
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