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dc.contributor.authorAmemiya, Naoyukien
dc.contributor.authorTominaga, Naokien
dc.contributor.authorToyomoto, Ryukien
dc.contributor.authorNishimoto, Takumaen
dc.contributor.authorSogabe, Yusukeen
dc.contributor.authorYamano, Satoshien
dc.contributor.authorSakamoto, Hisakien
dc.contributor.alternative雨宮, 尚之ja
dc.contributor.alternative富永, 直樹ja
dc.contributor.alternative豊本, 竜希ja
dc.contributor.alternative西本, 拓馬/ 曽我部, 友輔ja
dc.date.accessioned2018-04-13T07:30:04Z-
dc.date.available2018-04-13T07:30:04Z-
dc.date.issued2018-02-
dc.identifier.issn0953-2048-
dc.identifier.urihttp://hdl.handle.net/2433/230567-
dc.description.abstractThe shielding-current-induced field is a serious concern for the applications of coated conductors to magnets. The striation of the coated conductor is one of the countermeasures, but it is effective only after the decay of the coupling current, which is characterised with the coupling time constant. In a non-twisted striated coated conductor, the coupling time constant is determined primarily by its length and the transverse resistance between superconductor filaments, because the coupling current could flow along its entire length. We measured and numerically calculated the frequency dependences of magnetisation losses in striated and copper-plated coated conductors with various lengths and their stacks at 77 K and determined their coupling time constants. Stacked conductors simulate the turns of a conductor wound into a pancake coil. Coupling time constants are proportional to the square of the conductor length. Stacking striated coated conductors increases the coupling time constants because the coupling currents in stacked conductors are coupled to one another magnetically to increase the mutual inductances for the coupling current paths. We carried out the numerical electromagnetic field analysis of conductors wound into pancake coils and determined their coupling time constants. They can be explained by the length dependence and mutual coupling effect observed in stacked straight conductors. Even in pancake coils with practical numbers of turns, i.e. conductor lengths, the striation is effective to reduce the shielding-current-induced fields for some dc applications.en
dc.language.isoeng-
dc.publisherIOP Publishingen
dc.rightsOriginal content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.en
dc.subjectcoated conductoren
dc.subjectcoupling time constanten
dc.subjectmagnetisationen
dc.subjectmultifilamenten
dc.subjectscreeningen
dc.subjectcurrenten
dc.subjectshielding currenten
dc.subjectstriationen
dc.subjectcoupling currenten
dc.titleCoupling time constants of striated and copper-plated coated conductors and the potential of striation to reduce shielding-current-induced fields in pancake coilsen
dc.typejournal article-
dc.type.niitypeJournal Article-
dc.identifier.jtitleSuperconductor Science and Technologyen
dc.identifier.volume31-
dc.identifier.issue2-
dc.relation.doi10.1088/1361-6668/aa9d24-
dc.textversionpublisher-
dc.identifier.artnum025007-
dc.addressDepartment of Electrical Engineering, Graduate School of Engineering, Kyoto Universityen
dc.addressDepartment of Electrical Engineering, Graduate School of Engineering, Kyoto Universityen
dc.addressDepartment of Electrical Engineering, Graduate School of Engineering, Kyoto Universityen
dc.addressDepartment of Electrical Engineering, Graduate School of Engineering, Kyoto Universityen
dc.addressDepartment of Electrical Engineering, Graduate School of Engineering, Kyoto Universityen
dc.addressHTS Engineering Department, Furukawa Electric Co., Ltd.・SuperPower Inc.en
dc.addressHTS Engineering Department, Furukawa Electric Co., Ltd.en
dcterms.accessRightsopen access-
datacite.awardNumber16H02326-
jpcoar.funderName日本学術振興会ja
jpcoar.funderName.alternativeJapan Society for the Promotion of Science (JSPS)en
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