Cross-field demagnetization of stacks of tapes: 3D modeling and measurements
Publication Date
2020-03-13Journal Title
Superconductor Science and Technology
ISSN
0953-2048
Publisher
IOP Publishing
Volume
33
Issue
4
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Kapolka, M., Pardo, E., Grilli, F., Baskys, A., Climente-Alarcon, V., Dadhich, A., & Glowacki, B. A. (2020). Cross-field demagnetization of stacks of tapes: 3D modeling and measurements. Superconductor Science and Technology, 33 (4) https://doi.org/10.1088/1361-6668/ab5aca
Abstract
Abstract: Stacks of superconducting (SC) tapes can trap much higher magnetic fields than conventional magnets. This makes them very promising for motors and generators. However, ripple magnetic fields in these machines present a cross-field component that demagnetizes the stacks. At present, there is no quantitative agreement between measurements and modeling of cross-field demagnetization, mainly due to the need for a 3D model that takes the end effects and real micron-thick SC layer into account. This article presents 3D modeling and measurements of cross-field demagnetization in stacks of up to 5 tapes and initial magnetization modeling of stacks of up to 15 tapes. 3D modeling of the cross-field demagnetization explicitly shows that the critical current density, Jc, in the direction perpendicular to the tape surface does not play a role in cross-field demagnetization. When taking the measured anisotropic magnetic field dependence of Jc into account, 3D calculations agree with measurements with less than a 4% deviation, while the error of 2D modeling is much higher. Then, our 3D numerical methods can realistically predict cross-field demagnetization. Due to the force-free configuration of part of the current density, J, in the stack, better agreement with experiments will probably require measuring the Jc anisotropy for the whole solid angle range, including J parallel to the magnetic field.
Keywords
Paper, Focus on Numerical Modelling of High Temperature Superconductors 2020, superconducting stacks, cross-field demagnetization, modeling of high temperature superconductors, 3D modeling, ReBCO coated conductors, supermagnets, rotating machines
Sponsorship
H2020 Societal Challenges (723119)
European Regional Development Fund (ITMS 26230120002)
Vedecká Grantová Agentúra MŠVVaŠ SR a SAV (VEGA) (2/0097/18)
Agentúra na Podporu Výskumu a Vývoja (APVV-14-0438)
Identifiers
sustab5aca, ab5aca, sust-103450.r1
External DOI: https://doi.org/10.1088/1361-6668/ab5aca
This record's URL: https://www.repository.cam.ac.uk/handle/1810/303386
Rights
Attribution 3.0 Unported (CC BY 3.0)
Licence URL: https://creativecommons.org/licenses/by/3.0/
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