Design, construction, and field mapping of the HISTRAP prototype dipole

HISTRAP is a proposed 2.67 T-m synchrotron-cooler-storage ring having eight 45°, C-design dipole magnets. A prototype dipole has been designed, fabricated, and mapped. The magnet design utilizes curved and angled coil ends to compensate for end effects in the field. Construction of the prototype dipole has been completed by the FNAL magnet factory. The magnetic field has been mapped using a Hall-effect probe affixed to a newly constructed, PC-based, horizontal positioning system. Results of the field mapping are presented. Results showing almost identical integrated and central profiles verified that the curved and angled coil end design did cancel the sextupole component found in typical C-shaped dipoles with straight coil ends. Except for the small quadrupole component, the predicted field profiles very accurately modeled the actual field profiles