Trapped Fields >1 T in a Bulk Superconducting Ring by Pulsed Field Magnetization
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Authors
Dennis, AR
Publication Date
2022Journal Title
IEEE Transactions on Applied Superconductivity
ISSN
1051-8223
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Type
Article
This Version
AM
Metadata
Show full item recordCitation
Tsui, Y., Moseley, D., Dennis, A., Shi, Y., Beck, M., Cientanni, V., Cardwell, D., et al. (2022). Trapped Fields >1 T in a Bulk Superconducting Ring by Pulsed Field Magnetization. IEEE Transactions on Applied Superconductivity https://doi.org/10.1109/TASC.2022.3160661
Abstract
One potential application of magnetized RE-Ba-Cu-O (where RE = rare earth or Y) bulk superconductors is as a high-field alternative to conventional permanent magnets in desktop NMR and MRI systems. Pulsed field magnetization (PFM) is one of the most promising practical methods of magnetizing such bulks. However, the trapped fields obtained by PFM are much lower than those obtained using quasi-static methods like field-cooling magnetization (FCM) due to heating during PFM. Furthermore, bulk superconducting rings have proved more difficult to magnetize via PFM than discs. The reported trapped fields in single bulk superconducting rings magnetized by PFM are less than 0.35 T at the centre of the bore due to thermomagnetic instabilities. In this work, systematic PFM measurements on a bulk Gd-Ba-Cu-O ring were carried out and a trapped field of 1.3 T at 55 K was achieved using a multi-pulse, stepwise cooling (MPSC) method. In the MPSC method, a sequence of pulsed fields is used to magnetize the ring bulk. The pulsed field is increased in small increments and the sample temperature is decreased sequentially. Consequently, as some field is already trapped after the first pulse, the motion of the flux for subsequent pulses will be reduced, leading to less heat generated in the bulk sample. This greatly improves the thermomagnetic stability of the PFM process, enabling larger trapped fields.
Relationships
Is supplemented by: https://doi.org/10.17863/CAM.81777
Sponsorship
EPSRC (EP/P020313/1; EP/T014679/1)
Funder references
Engineering and Physical Sciences Research Council (EP/P020313/1)
EPSRC (EP/T014679/1)
Identifiers
External DOI: https://doi.org/10.1109/TASC.2022.3160661
This record's URL: https://www.repository.cam.ac.uk/handle/1810/335031
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