15 T Cryocooled Nb<sub>3</sub>Sn Superconducting Magnet with a 52 mm Room Temperature Bore

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  • Watanabe Kazuo
    Institute for Materials Research, Tohoku University, Sendai 980–8577, Japan CREST, Japan Science and Technology Corporation, Tsukuba 305–0047, Japan
  • Awaji Satoshi
    Institute for Materials Research, Tohoku University, Sendai 980–8577, Japan CREST, Japan Science and Technology Corporation, Tsukuba 305–0047, Japan
  • Motokawa Mitsuhiro
    Institute for Materials Research, Tohoku University, Sendai 980–8577, Japan CREST, Japan Science and Technology Corporation, Tsukuba 305–0047, Japan
  • Mikami Yukio
    Sumitomo Heavy Industries Ltd., Hiratsuka 254–0806, Japan
  • Sakuraba Junji
    Sumitomo Heavy Industries Ltd., Hiratsuka 254–0806, Japan
  • Watazawa Keiichi
    Sumitomo Heavy Industries Ltd., Hiratsuka 254–0806, Japan

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  • 15 T Cryocooled Nb3Sn Superconducting Magnet with a 52 mm Room Temperature Bore.
  • 15T Cryocooled Nb3Sn Superconducting Ma

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We succeeded in demonstrating a 15.1 T cryocooled Nb3Sn superconducting magnet with a 52 mm room temperature bore. Two operating currents of 157 A and 90 A for the divided section coils were utilized for the first time in a cryocooled superconducting magnet system. It is found that the current leads are no longer the dominant heat loads because of the use of high-temperature superconductors. In order to realize a high-field cryocooled superconducting magnet comparable to the usual superconducting magnet immersed in liquid helium at 4.2 K, we maintained the coil temperature at a value below 5.0 K during the field sweep in a high magnetic field region.

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