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Page A.G.,University of Cambridge | Page A.G.,Ecole Polytechnique Federale de Lausanne | Patel A.,University of Cambridge | Baskys A.,University of Cambridge | And 6 more authors.
Superconductor Science and Technology | Year: 2015

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. © 2015 IOP Publishing Ltd. Source

Patel A.,University of Cambridge | Hopkins S.C.,University of Cambridge | Baskys A.,University of Cambridge | Kalitka V.,ZAO SuperOx | And 4 more authors.
Superconductor Science and Technology | Year: 2015

Stacks of superconducting tape can be used as composite bulk superconductors for both trapped field magnets and for magnetic levitation. Little previous work has been done on quantifying the levitation force behavior between stacks of tape and permanent magnets. This paper reports the axial levitation force properties of superconducting tape wound into pancake coils to act as a composite bulk cylinder, showing that similar stable forces to those expected from a uniform bulk cylinder are possible. Force creep was also measured and simulated for the system. The geometry tested is a possible candidate for a rotary superconducting bearing. Detailed finite element modeling in COMSOL Multiphysics was also performed including a full critical state model for induced currents, with temperature and field dependent properties and 3D levitation force models. This work represents one of the most complete levitation force modeling frameworks yet reported using the H-formulation and helps explain why the coil-like stacks of tape are able to sustain levitation forces. The flexibility of geometry and consistency of superconducting properties offered by stacks of tapes, make them attractive for superconducting levitation applications. © 2015 IOP Publishing Ltd. Source

Mitchell-Williams T.B.,University of Cambridge | Baskys A.,University of Cambridge | Hopkins S.C.,University of Cambridge | Kalitka V.,ZAO SuperOx | And 5 more authors.
Superconductor Science and Technology | Year: 2016

The trapped magnetic field profile of stacks of GdBa2Cu3O7-x superconducting tape was investigated. Angled stacks of superconducting tape were magnetized and found to produce very uniform trapped field profiles. The angled stacks were made of 12 mm 24 mm solder coated tape pieces and were bonded together following a brief consolidation heat treatment. Layering multiple stacks together and adding a ferromagnetic plate beneath the samples were both found to enhance the magnitude and uniformity of the trapped field profiles. Stationary and time-dependent critical state finite element models were also developed to complement the experimental results and investigate the magnetization process. The size and shapes possible with the angled stacks make them attractive for applications requiring uniform magnetic fields over larger areas than can be achieved with existing bulk rings or tape annuli. © 2016 IOP Publishing Ltd. Source

Lee S.,SuperOx Japan LLC | Petrykin V.,SuperOx Japan LLC | Molodyk A.,ZAO SuperOx | Samoilenkov S.,ZAO SuperOx | And 4 more authors.
Superconductor Science and Technology | Year: 2014

The SuperOx and SuperOx Japan LLC companies were founded with the goal of developing a cost-effective technology for second generation HTS (2G HTS) tapes by utilizing a combination of the most advanced chemical and physical deposition techniques, together with implementing original tape architectures. In this paper we present a brief overview of our production and experimental facilities and recent results of 2G HTS tape fabrication, and describe the first tests of the tapes in model cables for AC and DC power application. © 2014 IOP Publishing Ltd. Source

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