Gyrokinetic study of turbulence suppression in a JET-ILW power scan

For exploring tokamak operation regimes that deliver both high β and good energy confinement, power scans at JET with ITER-like wall have been performed. Relatively weak degradation of the confinement time coincides with increased core temperature of the ions at high power. The changes in core turbu...

Descripción completa

Detalles Bibliográficos
Autores: Doerk, H., Challis, C., Citrin, J., García, J., Görler, T., Jenko, F., Jet Contributors, García Muñoz, Manuel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2016
País:España
Institución:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:idus.us.es:11441/100494
Acceso en línea:https://hdl.handle.net/11441/100494
https://doi.org/10.1088/0741-3335/58/11/115005
Access Level:acceso abierto
Palabra clave:Tokamak
Gyrokinetic simulation
Thermal transport
Electromagnetic turbulence
id ES_ce1432be8e2a8e44fcff4c14fbbead79
oai_identifier_str oai:idus.us.es:11441/100494
network_acronym_str ES
network_name_str España
repository_id_str
spelling Gyrokinetic study of turbulence suppression in a JET-ILW power scanDoerk, H.Challis, C.Citrin, J.García, J.Görler, T.Jenko, F.Jet ContributorsGarcía Muñoz, ManuelTokamakGyrokinetic simulationThermal transportElectromagnetic turbulenceFor exploring tokamak operation regimes that deliver both high β and good energy confinement, power scans at JET with ITER-like wall have been performed. Relatively weak degradation of the confinement time coincides with increased core temperature of the ions at high power. The changes in core turbulence characteristics during a power scan with an optimized (broad) q profile are analyzed by means of nonlinear gyrokinetic simulations. The increase in β is crucial for stabilizing ion temperature gradient driven turbulence, accompanied by increased ion to electron temperature ratio, the presence of a dynamic fast ion species, as well as the geometric stabilization by increased thermal and suprathermal pressure. A sensitivity study with respect to the q profile reveals that electromagnetic effects are more pronounced at larger values of q. Further, it is confirmed that turbulence suppression due to rotation becomes less effective in such strongly electromagnetic systems. Electrostatic simplified models may thus perform well in present-day devices, in which high β is often correlated with high rotation, but provide poor extrapolation towards low rotation devices. Implications for ITER and reactor plasmas are discussed.EURATOM 633053European Unions Seventh Framework Programme FP7/2007–2013ERC 277870IOP PublishingFísica Atómica, Molecular y NuclearRNM138: Física Nuclear Aplicada2016info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/100494https://doi.org/10.1088/0741-3335/58/11/115005reponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésPlasma Physics and Controlled Fusion, 58 (11), 115005-.633053FP7/2007–2013277870http://dx.doi.org/10.1088/0741-3335/58/11/115005info:eu-repo/semantics/openAccessoai:idus.us.es:11441/1004942026-06-17T12:51:07Z
dc.title.none.fl_str_mv Gyrokinetic study of turbulence suppression in a JET-ILW power scan
title Gyrokinetic study of turbulence suppression in a JET-ILW power scan
spellingShingle Gyrokinetic study of turbulence suppression in a JET-ILW power scan
Doerk, H.
Tokamak
Gyrokinetic simulation
Thermal transport
Electromagnetic turbulence
title_short Gyrokinetic study of turbulence suppression in a JET-ILW power scan
title_full Gyrokinetic study of turbulence suppression in a JET-ILW power scan
title_fullStr Gyrokinetic study of turbulence suppression in a JET-ILW power scan
title_full_unstemmed Gyrokinetic study of turbulence suppression in a JET-ILW power scan
title_sort Gyrokinetic study of turbulence suppression in a JET-ILW power scan
dc.creator.none.fl_str_mv Doerk, H.
Challis, C.
Citrin, J.
García, J.
Görler, T.
Jenko, F.
Jet Contributors
García Muñoz, Manuel
author Doerk, H.
author_facet Doerk, H.
Challis, C.
Citrin, J.
García, J.
Görler, T.
Jenko, F.
Jet Contributors
García Muñoz, Manuel
author_role author
author2 Challis, C.
Citrin, J.
García, J.
Görler, T.
Jenko, F.
Jet Contributors
García Muñoz, Manuel
author2_role author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Física Atómica, Molecular y Nuclear
RNM138: Física Nuclear Aplicada
dc.subject.none.fl_str_mv Tokamak
Gyrokinetic simulation
Thermal transport
Electromagnetic turbulence
topic Tokamak
Gyrokinetic simulation
Thermal transport
Electromagnetic turbulence
description For exploring tokamak operation regimes that deliver both high β and good energy confinement, power scans at JET with ITER-like wall have been performed. Relatively weak degradation of the confinement time coincides with increased core temperature of the ions at high power. The changes in core turbulence characteristics during a power scan with an optimized (broad) q profile are analyzed by means of nonlinear gyrokinetic simulations. The increase in β is crucial for stabilizing ion temperature gradient driven turbulence, accompanied by increased ion to electron temperature ratio, the presence of a dynamic fast ion species, as well as the geometric stabilization by increased thermal and suprathermal pressure. A sensitivity study with respect to the q profile reveals that electromagnetic effects are more pronounced at larger values of q. Further, it is confirmed that turbulence suppression due to rotation becomes less effective in such strongly electromagnetic systems. Electrostatic simplified models may thus perform well in present-day devices, in which high β is often correlated with high rotation, but provide poor extrapolation towards low rotation devices. Implications for ITER and reactor plasmas are discussed.
publishDate 2016
dc.date.none.fl_str_mv 2016
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/11441/100494
https://doi.org/10.1088/0741-3335/58/11/115005
url https://hdl.handle.net/11441/100494
https://doi.org/10.1088/0741-3335/58/11/115005
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Plasma Physics and Controlled Fusion, 58 (11), 115005-.
633053
FP7/2007–2013
277870
http://dx.doi.org/10.1088/0741-3335/58/11/115005
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv IOP Publishing
publisher.none.fl_str_mv IOP Publishing
dc.source.none.fl_str_mv reponame:idUS. Depósito de Investigación de la Universidad de Sevilla
instname:Universidad de Sevilla (US)
instname_str Universidad de Sevilla (US)
reponame_str idUS. Depósito de Investigación de la Universidad de Sevilla
collection idUS. Depósito de Investigación de la Universidad de Sevilla
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869419935855280128
score 15,298079

Similares en LA Referencia