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Description
A hybrid magnet which is capable of producing more than 40 T steady field has been put into operation eraly this year at CHMFL. The superconducting outsert of the hybrid magnet is wound with Nb3Sn CICC and cooled with forced flow supercritical helium at 4.5 K. A multi-channel cryogenic transfer line is mounted between the magnet cryostat and the cryo-distribution box to transfer supercritical helium and electric current. Inside the cryogenic transfer line there are four pipes for helium feeding, two pipes for helium return, a pair of busbars and several electrical joints. Also a vacuum barrier is located at the intermediate section in order to ensure the independence of the vacuum of the magnet cryostat and the cryo-distribution box. Design, assembly and testing of the cryogenic transfer line will be presented in this paper.