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The role of magnetic islands in modifying long range temporal correlations of density fluctuations and local heat transport

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dc.affiliation.dptoUC3M. Departamento de Físicaes
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Física de Plasmases
dc.contributor.authorVan Milligen, B.Ph.
dc.contributor.authorEstrada, T.
dc.contributor.authorGarcía Gonzalo, Luis
dc.contributor.authorLópez Bruna, Daniel
dc.contributor.authorCarreras Verdaguer, Benjamin A.
dc.contributor.authorXu, Y.
dc.contributor.authorOchando, M.
dc.contributor.authorHidalgo, C.
dc.contributor.authorReynolds Barredo, José Miguel
dc.contributor.authorLópez Fraguas, A.
dc.contributor.funderMinisterio de Economía y Competitividad (España)es
dc.contributor.funderEuropean Commissionen
dc.date.accessioned2021-05-07T07:45:37Z
dc.date.available2021-05-07T07:45:37Z
dc.date.issued2016-01
dc.description.abstractThis work explores the relation between magnetic islands, long range temporal correlations and heat transport. A low order rational surface (t = 3/2) was purposely scanned outward through an electron cyclotron resonance heated (ECRH) plasma in the TJ-II stellarator. Density turbulence and the poloidal flow velocity were characterized using a two channel Doppler reflectometer. Simultaneously, the ECRH power was modulated to characterize heat transport, using measurements from a 12 channel electron cyclotron emission diagnostic. A systematic variation of the poloidal velocity was found to be associated with the t = 3/2 rational surface. Near the rational surface, the Hurst exponent, quantifying the nature of long-range correlations, was reduced below 0.5 (indicating subdiffusion), while at radii smaller than that of the rational surface, it was found to be significantly enhanced (superdiffusion). In the latter region, heat transport was enhanced as well, thus establishing a link between density fluctuations and anomalous heat transport. The observed variation of the Hurst exponent was consistent with a magnetohydrodynamic turbulence simulation.en
dc.format.extent12
dc.identifier.bibliographicCitationvan Milligen, B., Estrada, T., García, L., López Bruna, D., Carreras, B., Xu, Y., Ochando, M., Hidalgo, C., Reynolds-Barredo, J. & López Fraguas, A. (2016). The role of magnetic islands in modifying long range temporal correlations of density fluctuations and local heat transport. Nuclear Fusion, 56(1), 016013.en
dc.identifier.doihttps://doi.org/10.1088/0029-5515/56/1/016013
dc.identifier.issn0029-5515
dc.identifier.publicationfirstpage016013
dc.identifier.publicationissue1
dc.identifier.publicationtitleNuclear Fusionen
dc.identifier.publicationvolume56
dc.identifier.urihttps://hdl.handle.net/10016/32558
dc.identifier.uxxiAR/0000017636
dc.language.isoeng
dc.publisherIOP Publishingen
dc.relation.projectIDGobierno de España. ENE2012-38620-C02-02es
dc.relation.projectIDGobierno de España. ENE2012-38620-C02-01es
dc.relation.projectIDGobierno de España. ENE2012-30832es
dc.relation.projectIDGobierno de España. ENE2013-48109-Pes
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/H2020-Euratom/633053/EU/EUROfusion
dc.rights© 2016 EURATOM
dc.rights.accessRightsopen access
dc.subject.ecienciaFísicaes
dc.subject.otherFusionen
dc.subject.otherStellaratoren
dc.subject.otherTurbulenceen
dc.subject.otherTransporten
dc.subject.otherTJ-IIen
dc.subject.otherNondiffusive transporten
dc.subject.otherTurbulent transporten
dc.subject.otherSelf-similarityen
dc.subject.otherFusion plasmasen
dc.subject.otherReflectometryen
dc.subject.otherBoundaryen
dc.subject.otherParadigmen
dc.subject.otherDynamicsen
dc.titleThe role of magnetic islands in modifying long range temporal correlations of density fluctuations and local heat transporten
dc.typeresearch article*
dc.type.hasVersionAM*
dspace.entity.typePublication
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