The effects of electron cyclotron heating and current drive on toroidal Alfven eigenmodes in tokamak plasmas

Dedicated studies performed for toroidal Alfvén eigenmodes (TAEs) in ASDEX-Upgrade (AUG) discharges with monotonic q-profiles have shown that electron cyclotron resonance heating (ECRH) can make TAEs more unstable. In these AUG discharges, energetic ions driving TAEs were obtained by ion cyclotron r...

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Autores: Sharapov, S. E., García Muñoz, Manuel, Zeeland, M. A. van, Bobkov, B., Classen, I. G. J., Galdón Quiroga, Joaquín, González Martín, Juan de Dios, Rodríguez Ramos, Mauricio, Sanchís Sánchez, Lucía
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2018
País:España
Institución:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:idus.us.es:11441/99691
Acceso en línea:https://hdl.handle.net/11441/99691
https://doi.org/10.1088/1361-6587/aa90ee
Access Level:acceso abierto
Palabra clave:Energetic particles
Alfvén eigenmodes
ECRH
ECCD
ICRH
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spelling The effects of electron cyclotron heating and current drive on toroidal Alfven eigenmodes in tokamak plasmasSharapov, S. E.García Muñoz, ManuelZeeland, M. A. vanBobkov, B.Classen, I. G. J.Galdón Quiroga, JoaquínGonzález Martín, Juan de DiosRodríguez Ramos, MauricioSanchís Sánchez, LucíaEnergetic particlesAlfvén eigenmodesECRHECCDICRHDedicated studies performed for toroidal Alfvén eigenmodes (TAEs) in ASDEX-Upgrade (AUG) discharges with monotonic q-profiles have shown that electron cyclotron resonance heating (ECRH) can make TAEs more unstable. In these AUG discharges, energetic ions driving TAEs were obtained by ion cyclotron resonance heating (ICRH). It was found that off-axis ECRH facilitated TAE instability, with TAEs appearing and disappearing on timescales of a few milliseconds when the ECRH power was switched on and off. On-axis ECRH had a much weaker effect on TAEs, and in AUG discharges performed with co- and counter-current electron cyclotron current drive (ECCD), the effects of ECCD were found to be similar to those of ECRH. Fast ion distributions produced by ICRH were computed with the PION and SELFO codes. A significant increase in Te caused by ECRH applied off-axis is found to increase the fast ion slowing-down time and fast ion pressure causing a significant increase in the TAE drive by ICRH-accelerated ions. TAE stability calculations show that the rise in Te causes also an increase in TAE radiative damping and thermal ion Landau damping, but to a lesser extent than the fast ion drive. As a result of the competition between larger drive and damping effects caused by ECRH, TAEs become more unstable. It is concluded, that although ECRH effects on AE stability in present-day experiments may be quite significant, they are determined by the changes in the plasma profiles and are not particularly ECRH specific.EURATOM 633053RCUK Energy Programme P012450/1IOP PublishingFísica Atómica, Molecular y NuclearRNM138: Física Nuclear Aplicada2018info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/99691https://doi.org/10.1088/1361-6587/aa90eereponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésPlasma Physics and Controlled Fusion, 60 (1), 1-10.633053P012450/1https://doi.org/10.1088/1361-6587/aa90eeinfo:eu-repo/semantics/openAccessoai:idus.us.es:11441/996912026-06-17T12:51:07Z
dc.title.none.fl_str_mv The effects of electron cyclotron heating and current drive on toroidal Alfven eigenmodes in tokamak plasmas
title The effects of electron cyclotron heating and current drive on toroidal Alfven eigenmodes in tokamak plasmas
spellingShingle The effects of electron cyclotron heating and current drive on toroidal Alfven eigenmodes in tokamak plasmas
Sharapov, S. E.
Energetic particles
Alfvén eigenmodes
ECRH
ECCD
ICRH
title_short The effects of electron cyclotron heating and current drive on toroidal Alfven eigenmodes in tokamak plasmas
title_full The effects of electron cyclotron heating and current drive on toroidal Alfven eigenmodes in tokamak plasmas
title_fullStr The effects of electron cyclotron heating and current drive on toroidal Alfven eigenmodes in tokamak plasmas
title_full_unstemmed The effects of electron cyclotron heating and current drive on toroidal Alfven eigenmodes in tokamak plasmas
title_sort The effects of electron cyclotron heating and current drive on toroidal Alfven eigenmodes in tokamak plasmas
dc.creator.none.fl_str_mv Sharapov, S. E.
García Muñoz, Manuel
Zeeland, M. A. van
Bobkov, B.
Classen, I. G. J.
Galdón Quiroga, Joaquín
González Martín, Juan de Dios
Rodríguez Ramos, Mauricio
Sanchís Sánchez, Lucía
author Sharapov, S. E.
author_facet Sharapov, S. E.
García Muñoz, Manuel
Zeeland, M. A. van
Bobkov, B.
Classen, I. G. J.
Galdón Quiroga, Joaquín
González Martín, Juan de Dios
Rodríguez Ramos, Mauricio
Sanchís Sánchez, Lucía
author_role author
author2 García Muñoz, Manuel
Zeeland, M. A. van
Bobkov, B.
Classen, I. G. J.
Galdón Quiroga, Joaquín
González Martín, Juan de Dios
Rodríguez Ramos, Mauricio
Sanchís Sánchez, Lucía
author2_role author
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 Energetic particles
Alfvén eigenmodes
ECRH
ECCD
ICRH
topic Energetic particles
Alfvén eigenmodes
ECRH
ECCD
ICRH
description Dedicated studies performed for toroidal Alfvén eigenmodes (TAEs) in ASDEX-Upgrade (AUG) discharges with monotonic q-profiles have shown that electron cyclotron resonance heating (ECRH) can make TAEs more unstable. In these AUG discharges, energetic ions driving TAEs were obtained by ion cyclotron resonance heating (ICRH). It was found that off-axis ECRH facilitated TAE instability, with TAEs appearing and disappearing on timescales of a few milliseconds when the ECRH power was switched on and off. On-axis ECRH had a much weaker effect on TAEs, and in AUG discharges performed with co- and counter-current electron cyclotron current drive (ECCD), the effects of ECCD were found to be similar to those of ECRH. Fast ion distributions produced by ICRH were computed with the PION and SELFO codes. A significant increase in Te caused by ECRH applied off-axis is found to increase the fast ion slowing-down time and fast ion pressure causing a significant increase in the TAE drive by ICRH-accelerated ions. TAE stability calculations show that the rise in Te causes also an increase in TAE radiative damping and thermal ion Landau damping, but to a lesser extent than the fast ion drive. As a result of the competition between larger drive and damping effects caused by ECRH, TAEs become more unstable. It is concluded, that although ECRH effects on AE stability in present-day experiments may be quite significant, they are determined by the changes in the plasma profiles and are not particularly ECRH specific.
publishDate 2018
dc.date.none.fl_str_mv 2018
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/11441/99691
https://doi.org/10.1088/1361-6587/aa90ee
url https://hdl.handle.net/11441/99691
https://doi.org/10.1088/1361-6587/aa90ee
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Plasma Physics and Controlled Fusion, 60 (1), 1-10.
633053
P012450/1
https://doi.org/10.1088/1361-6587/aa90ee
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 15,300724

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