A cryocooler cooled 5 T superconducting magnet with a horizontal and vertical room temperature bore

We designed and constructed a cryocooler cooled 5 T superconducting magnet with a horizontal room temperature bore of 50 mm and a vertical room temperature bore of 90 mm without liquid helium. The magnet, which is directly cooled by 4 K Gifford-McMahon cryocooler in vacuum, consists of NbTi coil, Bi...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 1997-06, Vol.7 (2), p.423-426
Main Authors: Jikihara, K., Watazawa, K., Mitsubori, H., Sukuraba, J., Sugizaki, Y., Hasebe, T., Okubo, H., Ishihara, M., Watanabe, K.
Format: Article
Language:English
Subjects:
Applied sciences
Boring
Conductors
Electrical engineering. Electrical power engineering
Electromagnets
Exact sciences and technology
Magnetic fields
Magnetic materials
Niobium compounds
Superconducting coils
Superconducting magnets
Temperature
Titanium compounds
Various equipment and components
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Summary:We designed and constructed a cryocooler cooled 5 T superconducting magnet with a horizontal room temperature bore of 50 mm and a vertical room temperature bore of 90 mm without liquid helium. The magnet, which is directly cooled by 4 K Gifford-McMahon cryocooler in vacuum, consists of NbTi coil, Bi(2223) bulk current leads and cryostat. The coil with an inner diameter of 130 mm, an outer diameter of 301 mm, a height of 66 mm and a gap of 80 mm is made using NbTi wires and Cu-plated SUS bobbin. Bi(2223) bulk current leads are thin-walled sintered cylindrical tubes. The outer diameter, height and weight of the magnet are 510 mm, 730 mm and 260 kg, respectively. The magnet is cooled down to 3.8 K in approximately 62 hours. A continuous operation at 5 T, which is generated by an operating current of 122 A, has been performed.
ISSN:1051-8223
1558-2515
DOI:10.1109/77.614519