A cryocooler-cooled 10 T superconducting magnet with 100 mm room temperature bore

Journal Article · Mon Jul 01 00:00:00 EDT 1996 · IEEE Transactions on Magnetics

DOI:https://doi.org/10.1109/20.511395· OSTI ID:287691

Koyanagi, K; Urata, M; Ohtani, Y ^[1]

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1. Toshiba R and D Center, Kawasaki, Kanagawa (Japan); and others

A NbTi/Nb{sub 3}Sn superconducting magnet directly cooled by a 4 K cryocooler has been fabricated. It successfully attained a 10 T field at the center of a 100 mm room temperature bore. A 4 K Gifford-McMahon (GM) cryocooler, using Er{sub 3}Ni regenerator, cools the magnet without the use of liquid helium. Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub y} superconducting power leads were adopted to reduce heat input to the 4 K stage. The coil heat is removed through heat conducting copper cylinders. The coil winding is epoxy-impregnated without a bore tube to stabilize the magnet against quenching. Two diode shunt circuits are placed in the cryostat to protect the coils. A fast ramp of 10 T/20 min. was attained by reducing Nb{sub 3}Sn conductor hysteresis loss and by decreasing the contact resistance between the coil and the conduction cylinder.

• OSTI ID: 287691
• Report Number(s): CONF-950691-; ISSN 0018-9464; TRN: 96:022962
• Journal Information: IEEE Transactions on Magnetics, Vol. 32, Issue 4Pt1; Conference: 14. international conference on magnet technology, Tampere (Finland), 11-16 Jun 1995; Other Information: PBD: Jul 1996
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
SUPERCONDUCTING MAGNETS
DESIGN
NIOBIUM ALLOYS
TITANIUM ALLOYS
TIN ALLOYS
COOLING SYSTEMS
MAGNETIC FIELDS
ERBIUM BASE ALLOYS
NICKEL ALLOYS
BISMUTH OXIDES
STRONTIUM OXIDES
CALCIUM OXIDES
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
CONDUCTOR DEVICES
HEAT TRANSFER
EQUIPMENT PROTECTION DEVICES
CRYOSTATS