The effect of stabilizer on the trapped field of stacks of superconducting tape magnetized by a pulsed field

Author: Page A G   Patel A   Baskys A   Hopkins S C   Kalitka V   Molodyk A   Glowacki B A  

Publisher: IOP Publishing

E-ISSN: 1361-6668|28|8|85009-85015

ISSN: 0953-2048

Source: Superconductor Science and Technology, Vol.28, Iss.8, 2015-08, pp. : 85009-85015

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Abstract

Stacks of high temperature superconducting tape, magnetized using pulsed fields, provide a new type of permanent magnet using superconductors. To optimize the trapped field in such stacks, the role of stabilization layers was investigated by pulse magnetizing a 12 mm square stack of 15 tape layers over a temperature range of 15–77 K. The stacks consisted of commercial tape with a silver stabilizer of 1–3 μm or tape with an additional 20 μm layer of copper on top of 1 μm of silver. It was found that the trapped field and flux are relatively insensitive to the stabilizer thickness, and 1 μm of silver only, led to the highest trapped field. An FEM model was also developed for a stack that considered for the first time both the actual thickness of metallic and superconducting layers, to investigate the effect of heating and heat transfer when a stack of tapes is magnetized.

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