title: Observation of confined current ribbon in JET plasmas.
abstract: We report the identification of a localized current structure inside the JET plasma. It is a field-aligned closed helical ribbon, carrying current in the same direction as the background current profile (cocurrent), rotating toroidally with the ion velocity (corotating). It appears to be located at a flat spot in the plasma pressure profile, at the top of the pedestal. The structure appears spontaneously in low density, high rotation plasmas, and can last up to 1.4 s, a time comparable to a local resistive time. It considerably delays the appearance of the first edge localized mode.
authors.affiliation: Laboratorio Nacional de Fusión, Asociación EURATOM-CIEMAT, 28040, Madrid, Spain.
authors.forename: E R
authors.initials: ER
authors.lastname: Solano
authors.forename: P J
authors.initials: PJ
authors.lastname: Lomas
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authors.lastname: Alper
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authors.initials: GS
authors.lastname: Xu
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authors.lastname: Andrew
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authors.lastname: Arnoux
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authors.lastname: Brix
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authors.lastname: Crombe
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authors.lastname: de la Luna
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authors.lastname: Devaux
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authors.lastname: Gerasimov
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authors.lastname: Howell
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authors.lastname: Huber
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authors.lastname: Kocsis
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authors.lastname: Korotkov
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authors.lastname: Lopez-Fraguas
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authors.lastname: Nave
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authors.lastname: Rachlew
authors.forename: F
authors.initials: F
authors.lastname: Rimini
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authors.lastname: Saarelma
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authors.lastname: Sirinelli
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authors.initials: SD
authors.lastname: Pinches
authors.forename: H
authors.initials: H
authors.lastname: Thomsen
authors.forename: L
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authors.lastname: Zabeo
authors.forename: D
authors.initials: D
authors.lastname: Zarzoso