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Critical current asymmetry in HTS switches using iron-core electromagnets

journal contribution
posted on 2023-01-23, 22:45 authored by James RiceJames Rice, RW Taylor, Dominic MoseleyDominic Moseley, A Petrov, H Zhang, S Wray, J Geng, Rodney BadcockRodney Badcock
Iron-core electromagnets are widely used as applied-field switches in high-temperature superconducting (HTS) flux pumps. It was recently reported that the critical current ( I c ) of the HTS wire is suppressed by up to 45% in the air gap of the iron core. Here, it is reported that the self-field I c of a single tape (unifilar) is suppressed from 357 A to 195 A while in the air gap of an iron core, agreeing closely with the previous study. This is extended by showing that the I c response to a perpendicular magnetic field is asymmetric, with a peak I c of 249 A found to be at 0.16 T of applied magnetic field. This effect can be eliminated using an anti-parallel current configuration (bifilar), which is shown experimentally to recover close to the no-core self-field I c of 357 A with no observed asymmetry. The results of both types of switch configurations are closely replicated in finite-element modelling using COMSOL Multiphysics®. This is caused by the asymmetric interaction between the self-induced magnetic field of the HTS switch element and the magnetic circuit of the iron-core electromagnet.

History

Preferred citation

Rice, J. H. P., Taylor, R. W., Moseley, D. A., Petrov, A., Zhang, H., Wray, S., Geng, J. & Badcock, R. A. (2023). Critical current asymmetry in HTS switches using iron-core electromagnets. Superconductor Science and Technology, 36(2), 025001-025001. https://doi.org/10.1088/1361-6668/aca8d8

Journal title

Superconductor Science and Technology

Volume

36

Issue

2

Publication date

2023-02-01

Pagination

025001-025001

Publisher

IOP Publishing

Publication status

Accepted

Online publication date

2022-12-15

ISSN

0953-2048

eISSN

1361-6668

Article number

ARTN 025001