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(o) (R/R(o))13.4. The f ield is generated by equally spaced magnets around the circumference a nd 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 o f the cryostat to allow for field fine tuning after construction. A se t of iron-free coil windings generate the required field distribution.