Mitigating ab-Plane Critical Current Density Inhomogeneity in Bulk HTS Rings for the Generation of NMR-Grade Magnetic Fields
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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
Beck, M., & Ainslie, M. (2022). Mitigating ab-Plane Critical Current Density Inhomogeneity in Bulk HTS Rings for the Generation of NMR-Grade Magnetic Fields. IEEE Transactions on Applied Superconductivity https://doi.org/10.1109/TASC.2022.3155539
Abstract
(RE)-Ba-Cu-O ring bulks, used as trapped field magnets, show great promise as a compact and lightweight source for generating the magnetic fields required for nuclear magnetic resonance (NMR). The inhomogeneities introduced by the growth pro-cess of such bulks pose a challenge to the required field uniformity for NMR. In this study, we model a stack of ring bulks with varying ab-plane inhomogeneity and orientation to investigate the impact on the trapped field profile following field cooled magnetization. For a pair of rings, by offsetting the growth sector boundaries (GSBs), the inhomogeneity of the circumferential field at the mid-plane can be reduced by up to 65% compared with aligned GSBs, for less than 0.4% reduction in the central trapped field strength. Using two pairs of rings allows for the generation of a larger homogeneous region at the center of the bore, with a lower peak-peak variation across the measuring volume. The relative harmonic weighting of the field moves to higher orders, requiring more complex shimming coils to correct the residual field.
Relationships
Is supplemented by: https://doi.org/10.17863/CAM.77587
Sponsorship
W.D. Armstrong Studentship in the Application of Engineering in Medicine;
EPSRC Early Career Fellowship, EP/P020313/1
Funder references
Engineering and Physical Sciences Research Council (EP/P020313/1)
Identifiers
External DOI: https://doi.org/10.1109/TASC.2022.3155539
This record's URL: https://www.repository.cam.ac.uk/handle/1810/334525
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