Magnet System for a 4-MeV Experimental Separated Orbit Cyclotron

One of six sector-magnets for the 4-MeV Separated Orbit Cyclotron Experiment (SOCE) has been assembled and tested. The magnets for the SOCE are quite different and much simplified from previous SOC magnet concepts; all pole tips are of the same radius of curvature and each set is excited by a separate coil-pair. The pole-tip fields vary smoothly from 3.5 kilogauss at injection (1 MeV) to 6.6 kilogauss at full energy. The field index, n, varies from 0.58 to 0.52. A unique pole-tip design with an integral vacuum chamber has been developed. The ampere-turn requirements for the main pole-tip coils and trimming coils have been determined. A simple but highly precise magnetic field scanning device has been developed for use with the SOCE magnets.