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A new MgB2bulk ring fabrication technique for use in magnetic shielding or bench-top NMR systems

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cam.issuedOnline2022-06-30
datacite.isderivedfrom.doi10.17863/CAM.78758
datacite.issupplementedby.doi10.17863/CAM.78758
dc.contributor.authorMoseley, DA
dc.contributor.authorWilkinson, DP
dc.contributor.authorMousavi, T
dc.contributor.authorDennis, AR
dc.contributor.authorSpeller, S
dc.contributor.authorDurrell, JH
dc.contributor.orcidMoseley, DA [0000-0001-7673-0024]
dc.contributor.orcidSpeller, S [0000-0002-6497-5996]
dc.contributor.orcidDurrell, JH [0000-0003-0712-3102]
dc.date.accessioned2022-06-30T10:00:03Z
dc.date.available2022-06-30T10:00:03Z
dc.date.issued2022
dc.date.submitted2022-03-31
dc.date.updated2022-06-30T10:00:02Z
dc.description.abstract<jats:title>Abstract</jats:title> <jats:p>We report a new methodology in bulk MgB<jats:sub>2</jats:sub> ring production for use in small-scale magnetic shielding or bench-top nuclear magnetic resonance systems. This process is a modified field-assisted sintering technique (mFAST) which enables direct formation of the rings without the need for machining or additives into the precursor powder. The shielding and trapped field capabilities of three mFAST MgB<jats:sub>2</jats:sub> rings were determined using zero-field- and field-cooled magnetic experiments. Individual bulks trap magnetic fields up to 1.24 T at 20 K comparable to the highest published data for a ring sample. It is anticipated that for many applications, multiple rings will be stacked to form the required experimental structure. We find, for the three ring stack, a trapped field of 2.04 T and a maximum shielded field of 1.74 T at 20 K. The major factor limiting performance at low temperatures are flux jumps which cause rapid loss of the trapped field or shielding capability. Preliminary studies of magnetic field ramp rate dependence on flux jumps were conducted illustrating that even at very slow ramp rates (0.007 T min<jats:sup>−1</jats:sup>) they remain a significant issue. Despite this concern, we conclude that mFAST represents an exciting new fabrication methodology for bulk MgB<jats:sub>2</jats:sub> rings.</jats:p>
dc.identifier.citationSuperconductor Science and Technology, volume 35, issue 8, article-number 085003
dc.identifier.doi10.17863/CAM.86041
dc.identifier.eissn1361-6668
dc.identifier.issn0953-2048
dc.identifier.othersustac7587
dc.identifier.otherac7587
dc.identifier.othersust-105088.r1
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/338629
dc.languageen
dc.language.isoeng
dc.publisherIOP Publishing
dc.publisher.urlhttp://dx.doi.org/10.1088/1361-6668/ac7587
dc.subjectMgB2
dc.subjectmagnetic shielding
dc.subjectNMR
dc.subjectbulk superconductors
dc.titleA new MgB<inf>2</inf>bulk ring fabrication technique for use in magnetic shielding or bench-top NMR systems
dc.typeArticle
dcterms.dateAccepted2022-06-02
prism.publicationNameSuperconductor Science and Technology
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/P023088/1)
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0
rioxxterms.versionVoR
rioxxterms.versionofrecord10.1088/1361-6668/ac7587

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