Cryocooler directly cooled 6 T NbTi superconducting magnet system with 180 mm room temperature bore

This paper describes a cryocooler cooled NbTi superconducting magnet system. The technical features of this magnet system are a 4K-Gifford-McMahon (GM) refrigerator using magnetic regenerator material and a high-Tc (Bi sub(2)Sr sub(2)CaCu sub(2)O sub(y)) superconducting current lead. The NbTi coil w...

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Bibliographic Details
Published in:Cryogenics (Guildford) 1994-01, Vol.34, p.no. Sul-no. Sul
Main Authors: Kuriyama, Toru, Urata, Masami, Yazawa, Takashi, Yamamoto, Kazutaka, Ohtani, Yasumi, Koyanagi, Kei, Masegi, Tamaki, Yamada, Yutaka, Nomura, Shunji, Maeda, Hideaki, Nakagome, Hideki, Horigami, Osamu
Format: Article
Language:English
Subjects:
Cooling systems
Heat transfer
Q1
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Summary:This paper describes a cryocooler cooled NbTi superconducting magnet system. The technical features of this magnet system are a 4K-Gifford-McMahon (GM) refrigerator using magnetic regenerator material and a high-Tc (Bi sub(2)Sr sub(2)CaCu sub(2)O sub(y)) superconducting current lead. The NbTi coil was directly cooled by the 4K-GM refrigerator without liquid helium and it took about 21 hours for the NbTi coil to be cooled from room temperature to below 4 K. The stable magnetic field of 6 T at 3.5 K and the maximum magnetic field of 6.45 T were obtained in the 180 mm room temperature bore.
ISSN:0011-2275