The impact of rational surfaces on radial heat transport in TJ-II

e-Archivo Repository

Show simple item record Van Milligen, B.Ph. Hernández Nicolau, Javier García Gonzalo, Luis Carreras Verdaguer, Benjamin Andres Hidalgo, C. 2021-05-07T08:20:11Z 2021-05-07T08:20:11Z 2017-05
dc.identifier.bibliographicCitation van Milligen, B., Nicolau, J., García, L., Carreras, B. & Hidalgo, C. (2017). The impact of rational surfaces on radial heat transport in TJ-II. Nuclear Fusion, 57(5), 056028.
dc.identifier.issn 0029-5515
dc.description Autor colectivo: TJ-II Team
dc.description.abstract In this work, we study the outward propagation of temperature perturbations. For this purpose, we apply an advanced analysis technique, transfer entropy, to ECE measurements performed in ECR heated discharges at the low-shear stellarator TJ-II. We observe that the propagation of these perturbations is not smooth, but is slowed down at specific radial positions, near 'trapping zones' characterized by long time lags with respect to the perturbation origin. We also detect instances of rapid or instantaneous (non-local) propagation, in which perturbations appear to 'jump over' specific radial regions. The analysis of perturbations introduced in a resistive magneto-hydrodynamic model of the plasma leads to similar results. The radial regions corresponding to slow radial transport are identified with maxima of the flow shear associated with rational surfaces (mini-transport barriers). The non-local interactions are ascribed to MHD mode coupling effects.
dc.format.extent 18
dc.language.iso eng
dc.publisher IOP Publishing
dc.rights © 2017 Centro de Investigaciones Energeticas Medioambientales y Tecnologicas
dc.subject.other Turbulence
dc.subject.other Transport
dc.subject.other Stellarator
dc.title The impact of rational surfaces on radial heat transport in TJ-II
dc.type article
dc.subject.eciencia Física
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. ENE2015-68265-P
dc.relation.projectID Gobierno de España. ENE2015-68206-P
dc.relation.projectID Gobierno de España. BES-2013-066825
dc.relation.projectID info:eu-repo/grantAgreement/EC/H2020-Euratom/633053/EU/EUROfusion
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 056028
dc.identifier.publicationissue 5
dc.identifier.publicationtitle Nuclear Fusion
dc.identifier.publicationvolume 57
dc.identifier.uxxi AR/0000019844
dc.contributor.funder Ministerio de Economía y Competitividad (España)
dc.contributor.funder European Commission
dc.affiliation.dpto UC3M. Departamento de Física
dc.affiliation.grupoinv UC3M. Grupo de Investigación: Física de Plasmas
 Find Full text

Files in this item

*Click on file's image for preview. (Embargoed files's preview is not supported)

This item appears in the following Collection(s)

Show simple item record