# Cross-field demagnetization of stacks of tapes: 3D modelling and measurements

Kapolka, Milan; Pardo, Enric; Grilli, Francesco; Baskys, Algirdas; Climente-Alarcon, Vicente; Dadhich, Anang; Glowacki, Bartek A

##### 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, J$_{c}$, 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 J$_{c}$ 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. ... mehr

 Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP) Publikationstyp Zeitschriftenaufsatz Publikationsjahr 2020 Sprache Englisch Identifikator ISSN: 0953-2048, 1361-6668 KITopen-ID: 1000125098 Erschienen in Superconductor science and technology Band 33 Heft 4 Seiten Art. Nr.: 044019 Vorab online veröffentlicht am 13.03.2020 Schlagwörter superconducting stacks, cross-field demagnetization, modeling of high temperature superconductors, 3D modeling, ReBCO coated conductors, supermagnets, rotating machines Nachgewiesen in Web of ScienceScopus
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