A cryocooler cooled 6T NbTi superconducting magnet with room temperature bore of 220mm
- Sumitomo Heavy Industries, Ltd., Hiratsuka (Japan)
- Tohoku Univ., Sendai (Japan). Inst. for Materials Research
The authors 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 a 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 334 mm, 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.
- OSTI ID:
- 287699
- Report Number(s):
- CONF-950691--
- Journal Information:
- IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 4Pt1 Vol. 32; ISSN IEMGAQ; ISSN 0018-9464
- Country of Publication:
- United States
- Language:
- English
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