Superconducting magnet design for Fixed-Field Alternating-Gradient (FFAG) accelerator

The FFAG accelerator requires static fields that increase with radius along the accelerator midplane according to B=B/sub 0/(R/R/sub 0/)/sup 13.4/. The field is generated by equally spaced magnets around the circumference and varies from a maximum of 4.1 T to a minimum of -1.9 T. The general coil design employs cryostable magnets wound with aluminum stabilized superconductor. Each magnet has resistive pole face windings outside of the cryostat to allow for field fine tuning after construction. A set of iron-free coil windings generate the required field distribution.<>