L to H mode transition: parametric dependencies of the temperature threshold

The L to H mode transition occurs at a critical power which depends on various parameters, such as the magnetic field, the density, etc. Experimental evidence on various tokamaks (JET, ASDEX-Upgrade, DIII-D, Alcator C-Mod) points towards the existence of a critical temperature characterizing the tra...

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Autores: Bourdelle, C., Chonê, L., Fedorczak, N., Garbet, X., Beyer, P., Jet Contributors, García Muñoz, Manuel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2015
País:España
Institución:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:idus.us.es:11441/100538
Acceso en línea:https://hdl.handle.net/11441/100538
https://doi.org/10.1088/0029-5515/55/7/073015
Access Level:acceso abierto
Palabra clave:Plasma physics
L H transition
Tokamak
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oai_identifier_str oai:idus.us.es:11441/100538
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repository_id_str
spelling L to H mode transition: parametric dependencies of the temperature thresholdBourdelle, C.Chonê, L.Fedorczak, N.Garbet, X.Beyer, P.Jet ContributorsGarcía Muñoz, ManuelPlasma physicsL H transitionTokamakThe L to H mode transition occurs at a critical power which depends on various parameters, such as the magnetic field, the density, etc. Experimental evidence on various tokamaks (JET, ASDEX-Upgrade, DIII-D, Alcator C-Mod) points towards the existence of a critical temperature characterizing the transition. This criterion for the L-H transition is local and is therefore easier to be compared to theoretical approaches. In order to shed light on the mechanisms of the transition, simple theoretical ideas are used to derive a temperature threshold (Tth). They are based on the stabilization of the underlying turbulence by a mean radial electric field shear. The nature of the turbulence varies as the collisionality decreases, from resistive ballooning modes to ion temperature gradient and trapped electron modes. The obtained parametric dependencies of the derived Tth are tested versus magnetic field, density, effective charge. Various robust experimental observations are reproduced, in particular Tth increases with magnetic field B and increases with density below the density roll-over observed on the power threshold.EURATOM 633053IOP PublishingFísica Atómica, Molecular y NuclearRNM138: Física Nuclear Aplicada2015info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/100538https://doi.org/10.1088/0029-5515/55/7/073015reponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésNuclear Fusion, 55 (7), 073015-.633053http://dx.doi.org/10.1088/0029-5515/55/7/073015info:eu-repo/semantics/openAccessoai:idus.us.es:11441/1005382026-06-17T12:51:07Z
dc.title.none.fl_str_mv L to H mode transition: parametric dependencies of the temperature threshold
title L to H mode transition: parametric dependencies of the temperature threshold
spellingShingle L to H mode transition: parametric dependencies of the temperature threshold
Bourdelle, C.
Plasma physics
L H transition
Tokamak
title_short L to H mode transition: parametric dependencies of the temperature threshold
title_full L to H mode transition: parametric dependencies of the temperature threshold
title_fullStr L to H mode transition: parametric dependencies of the temperature threshold
title_full_unstemmed L to H mode transition: parametric dependencies of the temperature threshold
title_sort L to H mode transition: parametric dependencies of the temperature threshold
dc.creator.none.fl_str_mv Bourdelle, C.
Chonê, L.
Fedorczak, N.
Garbet, X.
Beyer, P.
Jet Contributors
García Muñoz, Manuel
author Bourdelle, C.
author_facet Bourdelle, C.
Chonê, L.
Fedorczak, N.
Garbet, X.
Beyer, P.
Jet Contributors
García Muñoz, Manuel
author_role author
author2 Chonê, L.
Fedorczak, N.
Garbet, X.
Beyer, P.
Jet Contributors
García Muñoz, Manuel
author2_role 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 Plasma physics
L H transition
Tokamak
topic Plasma physics
L H transition
Tokamak
description The L to H mode transition occurs at a critical power which depends on various parameters, such as the magnetic field, the density, etc. Experimental evidence on various tokamaks (JET, ASDEX-Upgrade, DIII-D, Alcator C-Mod) points towards the existence of a critical temperature characterizing the transition. This criterion for the L-H transition is local and is therefore easier to be compared to theoretical approaches. In order to shed light on the mechanisms of the transition, simple theoretical ideas are used to derive a temperature threshold (Tth). They are based on the stabilization of the underlying turbulence by a mean radial electric field shear. The nature of the turbulence varies as the collisionality decreases, from resistive ballooning modes to ion temperature gradient and trapped electron modes. The obtained parametric dependencies of the derived Tth are tested versus magnetic field, density, effective charge. Various robust experimental observations are reproduced, in particular Tth increases with magnetic field B and increases with density below the density roll-over observed on the power threshold.
publishDate 2015
dc.date.none.fl_str_mv 2015
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/11441/100538
https://doi.org/10.1088/0029-5515/55/7/073015
url https://hdl.handle.net/11441/100538
https://doi.org/10.1088/0029-5515/55/7/073015
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Nuclear Fusion, 55 (7), 073015-.
633053
http://dx.doi.org/10.1088/0029-5515/55/7/073015
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
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score 15,301603

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