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--
• 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

Related Subjects

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