Speaker
Description
The hybrid magnet which consists of a 34T resistive inserts and an 11T superconducting outsert has been put into operation early this year at CHMFL. The superconducting outsert made of Nb3Sn CICC is cooled with forced flow supercritical helium at 4.5 K. The main helium cryogenic system includes a helium refrigerator and a helium distribution system for the cooling of superconducting coils, structures, transfer lines and current leads. The helium refrigerator was successfully commissioned at early 2012 and has been operated at liquefaction mode for 5 years. The helium distribution system assembly was finished, and then the first commissioning of helium cryogenic system was carried out at the end of 2016. In this paper, assembly and commissioning of the helium cryogenic system for the hybrid superconducting outsert will be presented.