Dendritic flux avalanches in a superconducting MgB2 tape

Author
Qureishy, Thomas
Laliena, Carlos
Martínez, Elena
Qviller, Atle Jorstad
Vestgården, Jørn Inge
Johansen, Tom Henning
Navarro, Rafael
Mikheenko, Pavlo
Date Issued
2017
Keywords
Superledere
Permalink
http://hdl.handle.net/20.500.12242/900
https://publications.ffi.no/123456789/900
DOI
10.1088/1361-6668/aa9244
Collection
Articles
Description
Qureishy, Thomas; Laliena, Carlos; Martínez, Elena; Qviller, Atle Jorstad; Vestgården, Jørn Inge; Johansen, Tom Henning; Navarro, Rafael; Mikheenko, Pavlo. Dendritic flux avalanches in a superconducting MgB2 tape. Superconductors Science and Technology 2017 ;Volum 30.(12) s. -
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Abstract
Tapes of MgB2 with high critical current have a significant technological potential, but can experience operational breakdown due to thermomagnetic instabilities. Such events are routinely registered by magnetisation measurements, but were never observed by direct imaging techniques. Here we report magneto-optical imaging visualisation of a tape with reduced thickness and enhanced critical current density. The spatial structure of the thermomagnetic avalanche events was resolved, and the reproducibility and nucleation thresholds were determined. Avalanches appearing at low fields are small intrusions at the tape edges, while larger fields create more extensive avalanches having dendritic structures similar to those observed in thin-film superconductors. In contrast to dendritic avalanches in thin films, the avalanches in the tapes show reproducibility to a larger extent.
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