title: Observations of multiple magnetic islands in the core of a reversed field pinch.
abstract: We describe in this Letter the first measurement of multiple islands in the core of a reversed field pinch (RFP). These islands appear with current profile modification leading to magnetic fluctuation reduction in the Madison symmetric torus RFP. Magnetic island widths decrease to an unprecedented level, reducing the overlap of adjacent islands and allowing distinct islands to appear. The structures are observed in multichord measurements of soft-x-ray emissivity. The soft-x-ray data is validated with Poincaré reconstructions of the magnetic field structure in the core.
authors.affiliation: Consorzio RFX, Associazione EURATOM-ENEA sulla Fusione, Corso Stati Uniti, 4 35127 Padova, Italy.
authors.forename: P
authors.initials: P
authors.lastname: Franz
authors.forename: L
authors.initials: L
authors.lastname: Marrelli
authors.forename: P
authors.initials: P
authors.lastname: Piovesan
authors.forename: B E
authors.initials: BE
authors.lastname: Chapman
authors.forename: P
authors.initials: P
authors.lastname: Martin
authors.forename: I
authors.initials: I
authors.lastname: Predebon
authors.forename: G
authors.initials: G
authors.lastname: Spizzo
authors.forename: R B
authors.initials: RB
authors.lastname: White
authors.forename: C
authors.initials: C
authors.lastname: Xiao