Design and testing of a dual 8-T 380-mm/12-T 220-mm split superconducting solenoid for ORNL

A superconducting high field magnet facility has recently been prepared for operation at the Oak Ridge National Laboratory (ORNL). The facility consists of a background NbTi coil and an insert coil made of Nb3Sn tape. The background coil produces an 8-T central field, with a peak field of 8.8 T, in a bore of 380 mm and contains radial access ports of 67- mm diam. The insert in conjunction with the background coil produces a central field of 12 T, with a peak field of 13.5 T, and provides radial access ports of 67-mm diam. Details of magnet design both for the background coil and insert coil will be presented. The protection scheme will be discussed and test results will be given.