Conduction-Cooling System for Superconducting Magnets at 20-30 K

• Published in: IEEE transactions on applied superconductivity Vol. 24; no. 3; pp. 1 - 4
• Main Authors: CHANG, Ho-Myung, SEUNG ILL LEE
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2014; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Arrays; Bolted joints; Bolting; Bolts; Conduction-cooling; Coolers; Copper; cryocooler; Cryogenics; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical machines; Electrical power engineering; Electromagnets; Exact sciences and technology; Heating; Miscellaneous; Power networks and lines; Special rotating machines; Spools; superconducting generator; Superconducting magnets; Superconductivity; Thermal conductivity; Thermal loading; Users connections and in door installation; Various equipment and components; Performance evaluation; Thermal contact; Cooling; Thermal management (packaging); Magnet; Connection; System design; Wind generator; Thermal load; Cryogenic temperature; Conduction system; Superconducting magnet; Cooler; Conduction-cooling; superconducting generator; Cryogenics; Cooling system; Superconducting generators; Thermal conductivity; System simulation; cryocooler; Single stage circuit; Turbine generator
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2013.2286680

A cryogenic system is designed and experimentally tested for superconducting magnets conductively cooled at 20-30 K by a cryocooler. Metallic parts are fabricated for the thermal connection between coldhead of a single-stage GM cooler and six magnet bobbins in hexagonal array, and assembled with bolt- joints. The material of all parts is oxygen-free copper with a high RRR value ( ~ 525), and the GM cooler is a newly released model from Sumitomo Heavy Industries. All six bobbins are uniformly cooled down to 13.0 K under no load and can be maintained at 20-30 K under additional thermal load of 26-60 W. It is verified by analytical simulation that this excellent performance is due to the extremely high thermal conductivity of copper conductors and the good thermal contacts by bolt-joints. The conduction-cooling system is a thermally feasible option for 20-30 K magnets, including the wind turbine generators.