Cryocoolers 8 pp 785-793 | Cite as

A 4 K G-M Refrigerator for Direct Cooling of a 6 T NbTi Superconducting Magnet System

  • T. Kuriyama
  • Y. Ohtani
  • M. Takahashi
  • H. Nakagome

Abstract

This paper describes the construction and experimental results of 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 (Bi2Sr2CaCu2Oy;Bi2212) superconducting current lead. The 4K-GM refrigerator with Er3Ni regenerator had the refrigeration capacity of 0.5 W at 4.2 K. The Bi2212 superconducting current lead reduced a heat load to the refrigerator. The NbTi coil was directly cooled by the 4K-GM refrigerator at 3 K level without liquid helium. The available magnetic field of 6 T at operating current of 128 A and the maximum magnetic field of 6.45 T were obtained in the 180 mm room temperature bore.

Keywords

Heat Load Liquid Helium Magnet System Current Lead Regenerator Material 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • T. Kuriyama
    • 1
  • Y. Ohtani
    • 1
  • M. Takahashi
    • 1
  • H. Nakagome
    • 1
  1. 1.Energy & Mechanical Research Labs., Research & Development CenterTOSHIBA Corp.Kawasaki, Kanagawa, 210Japan

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