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Two-Dimensional Designs of Radiation Hard Conventional Multipole Magnets at FRIB

The Facility for Rare Isotope Beams (FRIB) calls for magnets with fields with varying multipole content. Magnets of this type can be fabricated with either conventional or superconducting windings. Many of these magnets will be located in regions with very high levels of neutron radiation. The radiation can cause heating in the conductor and any iron that is around the conductor. This report describes a magnet that is a combined sextupole and octupole. Because of the high radiation environment this magnet will see, the magnet designs presented here use conventional copper conductors. Three coil and iron designs are presented in this paper. Since FRIB is a single pass machine, the design field requirements for this magnet are not as stringent as they would be for a typical circular accelerator.