dc.creator | Roccella, R. | es |
dc.creator | Roccella, M. | es |
dc.creator | Riccardo, V. | es |
dc.creator | Chiocchio, S. | es |
dc.creator | Jet Contributors | es |
dc.creator | García Muñoz, Manuel | es |
dc.date.accessioned | 2020-08-27T14:27:33Z | |
dc.date.available | 2020-08-27T14:27:33Z | |
dc.date.issued | 2016-10 | |
dc.identifier.citation | Roccella, 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.issn | 0029-5515 | es |
dc.identifier.uri | https://hdl.handle.net/11441/100498 | |
dc.description.abstract | During 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.sponsorship | EURATOM 633053 | es |
dc.format | application/pdf | es |
dc.format.extent | 12 p. | es |
dc.language.iso | eng | es |
dc.publisher | IOP Publishing | es |
dc.relation.ispartof | Nuclear Fusion, 56 (10), 106010-. | |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.subject | JET | es |
dc.subject | ITER | es |
dc.subject | Asymmetric vertical displacement events | es |
dc.subject | Sideways forces | es |
dc.subject | Halo currents | es |
dc.subject | ATEC | es |
dc.title | Asymmetric toroidal eddy currents (ATEC) to explain sideways forces at JET | es |
dc.type | info:eu-repo/semantics/article | es |
dcterms.identifier | https://ror.org/03yxnpp24 | |
dc.type.version | info:eu-repo/semantics/publishedVersion | es |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es |
dc.contributor.affiliation | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear | es |
dc.relation.projectID | 633053 | es |
dc.relation.publisherversion | http://dx.doi.org/10.1088/0029-5515/56/10/106010 | es |
dc.identifier.doi | 10.1088/0029-5515/56/10/106010 | es |
dc.contributor.group | Universidad de Sevilla. RNM138: Física Nuclear Aplicada | es |
dc.journaltitle | Nuclear Fusion | es |
dc.publication.volumen | 56 | es |
dc.publication.issue | 10 | es |
dc.publication.initialPage | 106010 | es |