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dc.creatorRoccella, R.es
dc.creatorRoccella, M.es
dc.creatorRiccardo, V.es
dc.creatorChiocchio, S.es
dc.creatorJet Contributorses
dc.creatorGarcía Muñoz, Manueles
dc.date.accessioned2020-08-27T14:27:33Z
dc.date.available2020-08-27T14:27:33Z
dc.date.issued2016-10
dc.identifier.citationRoccella, R., Roccella, M., Riccardo, V., Chiocchio, S., Jet Contributors, y García Muñoz, M. (2016). Asymmetric toroidal eddy currents (ATEC) to explain sideways forces at JET. Nuclear Fusion, 56 (10), 106010-.
dc.identifier.issn0029-5515es
dc.identifier.urihttps://hdl.handle.net/11441/100498
dc.description.abstractDuring some JET vertical displacement events (VDEs) plasma current and position are found to be toroidally asymmetric. When asymmetries lock, the vessel has been observed to move horizontally, consequently strong horizontal forces are expected following plasma asymmetries, whether locked or rotating. The cause of horizontal forces is, as already identified in previous works, the asymmetric circulation of current in the structures. The physics mechanism responsible for these asymmetric currents is instead an open issue and it is the object of the present analysis. In particular it will be shown that the asymmetry is not due to a direct exchange of current between plasma and structure (as in the case of halo currents) but to asymmetric conductive paths which arise, in the structures, when the plasma column asymmetrically wets the wall. Simulations of this phenomenon using finite element (FE) models have been conducted to reproduce the JET observation during locked and rotating asymmetric VDEs. Estimated sideways force, asymmetry (I p asym) and normalized asymmetry (Ap asym) of plasma current, vertical position at different toroidal locations during the disruption and halo current asymmetry have been compared with measurements done at JET during upward AVDEs. The substantial match between experiments and simulations confirms the soundness of the assumptions. Furthermore, the same physical model applied to downward VDEs shows that divertor support and coils, together with the geometry of the limiting surfaces, considerably lessen asymmetric loads as experienced at JET after installing those components.es
dc.description.sponsorshipEURATOM 633053es
dc.formatapplication/pdfes
dc.format.extent12 p.es
dc.language.isoenges
dc.publisherIOP Publishinges
dc.relation.ispartofNuclear Fusion, 56 (10), 106010-.
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internacional*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectJETes
dc.subjectITERes
dc.subjectAsymmetric vertical displacement eventses
dc.subjectSideways forceses
dc.subjectHalo currentses
dc.subjectATECes
dc.titleAsymmetric toroidal eddy currents (ATEC) to explain sideways forces at JETes
dc.typeinfo:eu-repo/semantics/articlees
dcterms.identifierhttps://ror.org/03yxnpp24
dc.type.versioninfo:eu-repo/semantics/publishedVersiones
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses
dc.contributor.affiliationUniversidad de Sevilla. Departamento de Física Atómica, Molecular y Nucleares
dc.relation.projectID633053es
dc.relation.publisherversionhttp://dx.doi.org/10.1088/0029-5515/56/10/106010es
dc.identifier.doi10.1088/0029-5515/56/10/106010es
dc.contributor.groupUniversidad de Sevilla. RNM138: Física Nuclear Aplicadaes
dc.journaltitleNuclear Fusiones
dc.publication.volumen56es
dc.publication.issue10es
dc.publication.initialPage106010es

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