Superconducting Solenoid Package Design, Fabrication, and Testing for FRIB

The Facility for Rare Isotope Beams (FRIB) is a continuous wave heavy ion beam linear accelerator. FRIB consists of 322 low/medium beta superconducting radio frequency (SRF) cavities in 48 cryomodules operating at 2 K. FRIB cryomodules utilize 70 8-T-superconducting solenoid packages for beam focusing and steering which operate at 4.5 K with a margin of +0.5 K [1]. Each package includes an 8-T main coil for beam focusing, a pair of bucking coils to reduce the high fringe field on the local magnetic shield of the cavities, and two sets of steering (dipole) coils for X and Y directions to correct beam direction due to transverse kicks it received in SRF cavities. The solenoid package is all made of superconducting (NbTi) wires. In this paper, the solenoid package design, fabrication, and testing results are presented.