A Dipole Magnet for the FRIB High Radiation Environment Nuclear Fragment Separator

Magnets in the fragment separator region of the Facility for Rare Isotope Beams (FRIB) would be subjected to extremely high radiation and heat loads. The critical elements of FRIB are the dipole magnets, which are used to select the desired isotopes. Since conventional NiTi and Nb
₃
Sn superconductors must operate at ~ 4.5 K, the removal of the high heat load generated in these magnets using these superconductors would be difficult. High-temperature superconductors have been shown to be radiation resistant and can operate in the 40 K temperature range where heat removal is an order of magnitude more efficient than at 4.5 K. The coils of this magnet must accommodate the large curvature from the 30° bend that the magnet will subtend. This paper will describe the magnetic and conceptual design for these magnets.