Design of cryo-refrigerator assisted HTS steering magnet for K500 cyclotron beam line

The steering magnet is required for the external beam line of K-500 cyclotron to provide corrective steering capabilities. A conventional copper based steering magnet for high rigidity beam (maximum up to 3.3 T-m) becomes very bulky and difficult to integrate in beam line if large steering (± 3 degree horizontal (X) and ± 1.5 degree vertical (Y)) is required. Recently, commercial availability of long length (more than 100 m) high temperature superconductor (HTS) tape along with availability of high power cryo-refrigerator has given opportunity to develop compact conduction-cooled HTS magnet operating at temperature of 20 K or even higher. Although many prototype magnets using HTS tape have been fabricated and evaluated, there are only few applications in the particle accelerator fields. The paper describes the physics design aspect of the X-Y steering magnet along with details of cryostat.