Reducing the risk of insulating magnets

Tupper, Michael; Fabian, P. E.; Beavers, Fred

doi:10.1109/77.828487

Cited by 3 publications

(1 citation statement)

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“…Alternatives include Mylar, braid or a varnish coating for R + W [45,46] and alumina based slurries for W + R coils [6,17,31,32,47,48]. One polyimide sheet was inserted to provide pancake-pancake insulation.…”

Section: Magnet Windingsmentioning

confidence: 99%

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

Sneary

Friend²,

Hampshire

2001

Supercond. Sci. Technol.

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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 (J c ) 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 8.3 × 10 4 A cm −2 (4.2 K) and 1.18 × 10 4 A cm −2 (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 ∼20% that was produced by the bending strain during the wind-and-react fabrication procedure and the ∼10% variation of the long length J c 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.

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