A cryocooler cooled 6t nbti superconducting magnet with room temperature bore of 220mm

K. Watazawa, J. Sakuraba, F. Hata, T. Hasebe, C. K. Chong, Y. Yamada, K. Watanabe, S. Awaji, T. Fukase

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

We are developing a cryocooler cooled 6T superconducting magnet without liquid helium and/or liquid nitrogen. This magnet, which is directly cooled by two 4K Gifford-McMahon(GM) cryocoolers in vacuum, consists of an graded NbTi coil, Bi-based oxide superconducting current leads and a persistent current switch. The coil is made using two types of NbTi wires and a copper bobbin. The coil with an inner diameter of 260mm, an outer diameter of 329mm, and a height of 334mm, is impregnated with grease to ensure a good heat conduction. The operating current for a central field of 6T in the 220mm room temperature bore is 152A. A mechanical persistent current switch is used to limit the load from the switch into the 4K GM cryocooler. Designed temperature of the magnet is 4. 9 K at the operating current of 152 A.

Original languageEnglish
Pages (from-to)2594-2597
Number of pages4
JournalIEEE Transactions on Magnetics
Volume32
Issue number4 PART 2
DOIs
Publication statusPublished - 1996 Dec 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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