dc.creator | Frassinetti, L. | es |
dc.creator | Beurskens, M. | es |
dc.creator | Saarelma, S. | es |
dc.creator | Boom, J. E. | es |
dc.creator | Delabie, E. | es |
dc.creator | Jet Contributors | es |
dc.creator | García Muñoz, Manuel | es |
dc.date.accessioned | 2020-08-26T14:43:58Z | |
dc.date.available | 2020-08-26T14:43:58Z | |
dc.date.issued | 2017-01 | |
dc.identifier.citation | Frassinetti, L., Beurskens, M., Saarelma, S., Boom, J.E., Delabie, E., Jet Contributors, y García Muñoz, M. (2017). Global and pedestal confinement and pedestal structure in dimensionless collisionality scans of low-triangularity H-mode plasmas in JET-ILW. Nuclear Fusion, 57 (1), 016012. https://doi.org/10.1088/0029-5515/57/1/016012. | |
dc.identifier.issn | 0029-5515 | es |
dc.identifier.uri | https://hdl.handle.net/11441/100457 | |
dc.description.abstract | Abstract
A dimensionless collisionality scan in low-triangularity plasmas in the Joint European Torus
with the ITER-like wall (JET-ILW) has been performed. The increase of the normalized
energy confinement (defined as the ratio between thermal energy confinement and Bohm
confinement time) with decreasing collisionality is observed. Moreover, at low collisionality,
a confinement factor H98, comparable to JET-C, is achieved. At high collisionality, the low
normalized confinement is related to a degraded pedestal stability and a reduction in the
density-profile peaking.
The increase of normalized energy confinement is due to both an increase in the pedestal
and in the core regions. The improvement in the pedestal is related to the increase of the
stability. The improvement in the core is driven by (i) the core temperature increase via
the temperature-profile stiffness and by (ii) the density-peaking increase driven by the low
collisionality.
Pedestal stability analysis performed with the ELITE (edge-localized instabilities in
tokamak equilibria) code has a reasonable qualitative agreement with the experimental results.
An improvement of the pedestal stability with decreasing collisionality is observed. The
improvement is ascribed to the reduction of the pedestal width, the increase of the bootstrap
current and the reduction of the relative shift between the positions of the pedestal density and
pedestal temperature.
The EPED1 model predictions for the pedestal pressure height are qualitatively
well correlated with the experimental results. Quantitatively, EPED1 overestimates the experimental pressure by 15–35%. In terms of the pedestal width, a correct agreement (within
10–15%) between the EPED1 and the experimental width is found at low collisionality. The
experimental pedestal width increases with collisionality. Nonetheless, an extrapolation to
low-collisionality values suggests that the width predictions from the KBM constraint are
reasonable for ITER. | es |
dc.description.sponsorship | EURATOM 633053 | es |
dc.format | application/pdf | es |
dc.format.extent | 17 p. | es |
dc.language.iso | eng | es |
dc.publisher | IOP Publishing | es |
dc.relation.ispartof | Nuclear Fusion, 57 (1), 016012. | |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.subject | JET-ILW | es |
dc.subject | Confinement | es |
dc.subject | Collisionality | es |
dc.subject | Pedestal | es |
dc.subject | Stability | es |
dc.title | Global and pedestal confinement and pedestal structure in dimensionless collisionality scans of low-triangularity H-mode plasmas in JET-ILW | 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/10.1088/0029-5515/57/1/016012 | es |
dc.identifier.doi | 10.1088/0029-5515/57/1/016012 | es |
dc.contributor.group | Universidad de Sevilla. RNM138: Física Nuclear Aplicada | es |
dc.journaltitle | Nuclear Fusion | es |
dc.publication.volumen | 57 | es |
dc.publication.issue | 1 | es |
dc.publication.initialPage | 016012 | es |