Mitigation of Shielding-Current-Induced Fields (SCIFs) in HTS Magnets for Accelerator Systems

– On cosine-theta dipole magnet for rotating gantry as an example –

Abstract

In HTS magnets for accelerator systems, the behaviour of shielding-current-induced fields (SCIFs) is complicated because they are required to generate precise magnetic fields at different load ratios. The behaviour of the SCIF in a designed HTS cosine-theta dipole magnet wound with coated conductors was numerically evaluated using three-dimensional electromagnetic field analyses. To mitigate influence of the SCIF on dipole and sextupole components of the magnetic field, we applied current adjustment and combined with HTS sextupole correction coils. The required operation patterns of the main dipole magnet and correction coils were determined by calculating the time-dependent SCIF in advance.