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Design, fabrication and performance of a 1.29 T Bi-2223 magnet

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The design and fabrication procedure of a laboratory-scale Bi-2223 tape superconducting magnet with a bore of 40 mm and a maximum field of 1.29 T at 4.2 K is presented. The magnet comprises six resin impregnated double-wound pancakes of bore diameter 40 mm fabricated via the react-and-wind route. Critical current density ( [iopmath latex="$J_c$"] Jc [/iopmath] ) measurements have been made as a function of magnetic field, angle and strain at 4.2 K and 77 K on short samples. In zero field, the critical current density for the superconducting cross-sectional area of the tape was [iopmath latex="$8.3\times10^4$"] 8.3×104 [/iopmath]  A cm [iopmath latex="$^{-2}$"] -2 [/iopmath] (4.2 K) and [iopmath latex="$1.18\times10^4$"] 1.18×104 [/iopmath]  A cm [iopmath latex="$^{-2}$"] -2 [/iopmath] (77 K). The electric field-current density characteristics of all the components of the coils when individually energized or with the whole magnet energized have been measured. Comparison between short sample measurements and performance of the magnet show that minimal additional damage occurred beyond the [iopmath latex="${\sim}20%$"] ~20% [/iopmath] that was produced by the bending strain during the wind-and-react fabrication procedure and the [iopmath latex="${\sim}10%$"] ~10% [/iopmath] variation of the long length [iopmath latex="$J_c$"] Jc [/iopmath] of the tape. Sufficient detail is provided for the non-specialist to assess both the use of potential brittle superconducting tapes for magnet technology and to construct a laboratory-scale magnet.

Document Type: Miscellaneous

Affiliations: 1: University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK 2: BICC General Superconductors, Oak Road, Wrexham LL13 9XP, UK

Publication date: July 1, 2001


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