Improved pulsed field magnetisation in MgB2 trapped-field magnets

D. A. Moseley; Difan Zhou; Vito Cientanni; Yee Kin Tsui; M. D. Ainslie; S. Speller; John H. Durrell

doi:10.1088/1361-6668/ac0951

Improved pulsed field magnetisation in MgB₂ trapped-field magnets

D. A. Moseley^*, Difan Zhou, Vito Cientanni, Yee Kin Tsui, M. D. Ainslie, S. Speller, John H. Durrell

^*Corresponding author for this work

Engineering

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Bulk superconductors can act as trapped-field magnets with the potential to be used for many applications such as portable medical magnet systems and rotating machines. Maximising the trapped field, particularly for practical magnetisation techniques such as pulsed field magnetisation (PFM), still remains a challenge. PFM is a dynamic process in which the magnetic field is driven into a superconducting bulk over milliseconds. This flux motion causes heating and a complex interplay between the magnetic and thermal properties. In this work, the local flux density during PFM in a MgB2 bulk superconductor has been studied. We find that improving the cooling architecture increases the flux trapping capabilities and alters the flux motion during PFM. These improvements lead to the largest trapped field (0.95 T) for a single MgB2 bulk sample magnetised by a solenoidal pulsed field magnet. The findings illustrate the fundamental role bulk cooling plays during PFM.

Original language	English
Article number	085018
Journal	Superconductor Science and Technology
Volume	34
Issue number	8
DOIs	https://doi.org/10.1088/1361-6668/ac0951
Publication status	Published - 5 Jul 2021

Keywords

flux jump
MgBbulk superconductor
pulsed field magnetization
trapped-field magnet

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title = "Improved pulsed field magnetisation in MgB2 trapped-field magnets",

abstract = "Bulk superconductors can act as trapped-field magnets with the potential to be used for many applications such as portable medical magnet systems and rotating machines. Maximising the trapped field, particularly for practical magnetisation techniques such as pulsed field magnetisation (PFM), still remains a challenge. PFM is a dynamic process in which the magnetic field is driven into a superconducting bulk over milliseconds. This flux motion causes heating and a complex interplay between the magnetic and thermal properties. In this work, the local flux density during PFM in a MgB2 bulk superconductor has been studied. We find that improving the cooling architecture increases the flux trapping capabilities and alters the flux motion during PFM. These improvements lead to the largest trapped field (0.95 T) for a single MgB2 bulk sample magnetised by a solenoidal pulsed field magnet. The findings illustrate the fundamental role bulk cooling plays during PFM.",

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AU - Moseley, D. A.

AU - Zhou, Difan

AU - Cientanni, Vito

AU - Tsui, Yee Kin

AU - Ainslie, M. D.

AU - Speller, S.

AU - Durrell, John H.

PY - 2021/7/5

Y1 - 2021/7/5

N2 - Bulk superconductors can act as trapped-field magnets with the potential to be used for many applications such as portable medical magnet systems and rotating machines. Maximising the trapped field, particularly for practical magnetisation techniques such as pulsed field magnetisation (PFM), still remains a challenge. PFM is a dynamic process in which the magnetic field is driven into a superconducting bulk over milliseconds. This flux motion causes heating and a complex interplay between the magnetic and thermal properties. In this work, the local flux density during PFM in a MgB2 bulk superconductor has been studied. We find that improving the cooling architecture increases the flux trapping capabilities and alters the flux motion during PFM. These improvements lead to the largest trapped field (0.95 T) for a single MgB2 bulk sample magnetised by a solenoidal pulsed field magnet. The findings illustrate the fundamental role bulk cooling plays during PFM.

AB - Bulk superconductors can act as trapped-field magnets with the potential to be used for many applications such as portable medical magnet systems and rotating machines. Maximising the trapped field, particularly for practical magnetisation techniques such as pulsed field magnetisation (PFM), still remains a challenge. PFM is a dynamic process in which the magnetic field is driven into a superconducting bulk over milliseconds. This flux motion causes heating and a complex interplay between the magnetic and thermal properties. In this work, the local flux density during PFM in a MgB2 bulk superconductor has been studied. We find that improving the cooling architecture increases the flux trapping capabilities and alters the flux motion during PFM. These improvements lead to the largest trapped field (0.95 T) for a single MgB2 bulk sample magnetised by a solenoidal pulsed field magnet. The findings illustrate the fundamental role bulk cooling plays during PFM.

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KW - MgBbulk superconductor

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Improved pulsed field magnetisation in MgB₂ trapped-field magnets

Abstract

Keywords

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