Publication: The role of magnetic islands in modifying long range temporal correlations of density fluctuations and local heat transport
dc.affiliation.dpto | UC3M. Departamento de Física | es |
dc.affiliation.grupoinv | UC3M. Grupo de Investigación: Física de Plasmas | es |
dc.contributor.author | Van Milligen, B.Ph. | |
dc.contributor.author | Estrada, T. | |
dc.contributor.author | García Gonzalo, Luis | |
dc.contributor.author | López Bruna, Daniel | |
dc.contributor.author | Carreras Verdaguer, Benjamin A. | |
dc.contributor.author | Xu, Y. | |
dc.contributor.author | Ochando, M. | |
dc.contributor.author | Hidalgo, C. | |
dc.contributor.author | Reynolds Barredo, José Miguel | |
dc.contributor.author | López Fraguas, A. | |
dc.contributor.funder | Ministerio de Economía y Competitividad (España) | es |
dc.contributor.funder | European Commission | en |
dc.date.accessioned | 2021-05-07T07:45:37Z | |
dc.date.available | 2021-05-07T07:45:37Z | |
dc.date.issued | 2016-01 | |
dc.description.abstract | This 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.extent | 12 | |
dc.identifier.bibliographicCitation | van 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.doi | https://doi.org/10.1088/0029-5515/56/1/016013 | |
dc.identifier.issn | 0029-5515 | |
dc.identifier.publicationfirstpage | 016013 | |
dc.identifier.publicationissue | 1 | |
dc.identifier.publicationtitle | Nuclear Fusion | en |
dc.identifier.publicationvolume | 56 | |
dc.identifier.uri | https://hdl.handle.net/10016/32558 | |
dc.identifier.uxxi | AR/0000017636 | |
dc.language.iso | eng | |
dc.publisher | IOP Publishing | en |
dc.relation.projectID | Gobierno de España. ENE2012-38620-C02-02 | es |
dc.relation.projectID | Gobierno de España. ENE2012-38620-C02-01 | es |
dc.relation.projectID | Gobierno de España. ENE2012-30832 | es |
dc.relation.projectID | Gobierno de España. ENE2013-48109-P | es |
dc.relation.projectID | info:eu-repo/grantAgreement/EC/H2020-Euratom/633053/EU/EUROfusion | |
dc.rights | © 2016 EURATOM | |
dc.rights.accessRights | open access | |
dc.subject.eciencia | Física | es |
dc.subject.other | Fusion | en |
dc.subject.other | Stellarator | en |
dc.subject.other | Turbulence | en |
dc.subject.other | Transport | en |
dc.subject.other | TJ-II | en |
dc.subject.other | Nondiffusive transport | en |
dc.subject.other | Turbulent transport | en |
dc.subject.other | Self-similarity | en |
dc.subject.other | Fusion plasmas | en |
dc.subject.other | Reflectometry | en |
dc.subject.other | Boundary | en |
dc.subject.other | Paradigm | en |
dc.subject.other | Dynamics | en |
dc.title | The role of magnetic islands in modifying long range temporal correlations of density fluctuations and local heat transport | en |
dc.type | research article | * |
dc.type.hasVersion | AM | * |
dspace.entity.type | Publication |
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