High Field Superconducting Magnets for Particle Accelerators

Based on an extensive study of NbTi/Cu dipoles cooled with 1.8 K pressurized helium II and Nb3Sn/Cu racetrack dipoles at 4.2 K, the merit and demerit of these two kinds of magnets are discussed from the viewpoint of practical applications in future accelerators. There are many thermal, mechanical and electromagnetic difficulties in designing high field accelerator magnets in the 10 T region. Our experience with NbTi/Cu and Nb3Sn/Cu dipole magnets is reported and possible designs for high field magnets are presented, based on results of detailed calculations.