Development of 5 T NbTi Superconducting Magnet with 160 mm Warm Bore for Magnetic Separation

摘要

A wide-bore 5 T NbTi superconducting magnet,for magnetic separator,with anoperational current of 106 A is designed and fabricated.This magnet with a φ60 mm room-temperature bore is installed in a vacuum cryostat and immersed in liquid helium.A two-stage4 K Gifford-McMahon(GM)cryocooler is used to maintain the cooling shield at 70 K and thecondenser at 4 K in order to achieve the zero vaporization loss of liquid helium.The coolingpower of the GM cryocooler is 1.5 W.In this paper,the design,heat leakage,stress analysis,quench protection characteristics and preliminary test results are presented.