EDA H-mode in ASDEX Upgrade: scans of heating power, fueling, and plasma current

Electron cyclotron resonance heating (ECRH) staircase discharges in strongly shaped plasmas were performed at the full-tungsten ASDEX Upgrade tokamak to investigate the enhanced Dα (EDA) H-mode, a high-confinement regime without edge localized modes (ELMs) that exhibits numerous desirable qualities...

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Autores: Gil, L., Pütterich, T., Silva, C., Hachmeister, D, Conway, G. D., David, P., Viezzer, Eleonora, Wolfrum, E.
Formato: artículo
Fecha de publicación:2025
País:España
Recursos:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:idus.us.es:11441/172514
Acesso em linha:https://hdl.handle.net/11441/172514
https://doi.org/10.1088/1741-4326/adb6bd
Access Level:acceso abierto
Palavra-chave:EDA H-mode
ASDEX Upgrade
Edge localized modes
Pedestal
Confinement
Quasi-coherent mode
No-ELM regime
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spelling EDA H-mode in ASDEX Upgrade: scans of heating power, fueling, and plasma currentGil, L.Pütterich, T.Silva, C.Hachmeister, DConway, G. D.David, P.Viezzer, EleonoraWolfrum, E.EDA H-modeASDEX UpgradeEdge localized modesPedestalConfinementQuasi-coherent modeNo-ELM regimeElectron cyclotron resonance heating (ECRH) staircase discharges in strongly shaped plasmas were performed at the full-tungsten ASDEX Upgrade tokamak to investigate the enhanced Dα (EDA) H-mode, a high-confinement regime without edge localized modes (ELMs) that exhibits numerous desirable qualities for future reactors. Heating power, fueling, and plasma current scans reveal rich dynamics as the plasma traverses different confinement regimes. The L-H transition typically occurs with a brief I-phase, sometimes followed by a short nonstationary ELM-free H-mode, before the quasi-coherent mode (QCM) sets in, marking the start of the EDA H-mode. After the pedestal fully develops, the plasma remains stationary until the heating power is raised above a certain threshold, causing ELMs. A novel criterion based on the normality of the divertor shunt current distribution is introduced to identify phases with ELMs, showing general applicability under a wide range of discharges and conditions. The no-ELM power boundary is found to increase with fueling, and too little deuterium gas puff results in a pathological nonstationary ELM-free H-mode without the QCM. Empirical scalings are derived for core, pedestal, and global parameters in EDA H-mode. These show, for example, that pedestal electron pressure increases sublinearly with power and almost quadratically with current. Line-averaged density is approximately proportional to plasma current but very weakly affected by power and fueling, whereas energy confinement time decreases sublinearly with power and increases supralinearly with current. The EDA H-mode achieves several reactor-relevant dimensionless parameters, most notably high Greenwald fraction and confinement enhancement factor over the entire heating power range. This dataset constitutes a versatile resource to plan EDA experiments in present and upcoming devices, also serving as a testbed for validating physics-based theories and models of the regime. Overall, the EDA H-mode remains promising and could become an important no-ELM scenario in future reactors such as SPARC and the full-tungsten ITER.Iop Publishing LtdFísica Atómica, Molecular y NuclearEuropean Union (UE)Fundação para a Ciência e a Tecnologia. Portugal2025info:eu-repo/semantics/articleapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/172514https://doi.org/10.1088/1741-4326/adb6bdreponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésNuclear Fusion, 65 (4), 046002.101052200UIDB/50010/2020, LA/P/0061/2020https://doi.org/10.1088/1741-4326/adb6bdinfo:eu-repo/semantics/openAccessoai:idus.us.es:11441/1725142026-06-17T12:51:07Z
dc.title.none.fl_str_mv EDA H-mode in ASDEX Upgrade: scans of heating power, fueling, and plasma current
title EDA H-mode in ASDEX Upgrade: scans of heating power, fueling, and plasma current
spellingShingle EDA H-mode in ASDEX Upgrade: scans of heating power, fueling, and plasma current
Gil, L.
EDA H-mode
ASDEX Upgrade
Edge localized modes
Pedestal
Confinement
Quasi-coherent mode
No-ELM regime
title_short EDA H-mode in ASDEX Upgrade: scans of heating power, fueling, and plasma current
title_full EDA H-mode in ASDEX Upgrade: scans of heating power, fueling, and plasma current
title_fullStr EDA H-mode in ASDEX Upgrade: scans of heating power, fueling, and plasma current
title_full_unstemmed EDA H-mode in ASDEX Upgrade: scans of heating power, fueling, and plasma current
title_sort EDA H-mode in ASDEX Upgrade: scans of heating power, fueling, and plasma current
dc.creator.none.fl_str_mv Gil, L.
Pütterich, T.
Silva, C.
Hachmeister, D
Conway, G. D.
David, P.
Viezzer, Eleonora
Wolfrum, E.
author Gil, L.
author_facet Gil, L.
Pütterich, T.
Silva, C.
Hachmeister, D
Conway, G. D.
David, P.
Viezzer, Eleonora
Wolfrum, E.
author_role author
author2 Pütterich, T.
Silva, C.
Hachmeister, D
Conway, G. D.
David, P.
Viezzer, Eleonora
Wolfrum, E.
author2_role author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Física Atómica, Molecular y Nuclear
European Union (UE)
Fundação para a Ciência e a Tecnologia. Portugal
dc.subject.none.fl_str_mv EDA H-mode
ASDEX Upgrade
Edge localized modes
Pedestal
Confinement
Quasi-coherent mode
No-ELM regime
topic EDA H-mode
ASDEX Upgrade
Edge localized modes
Pedestal
Confinement
Quasi-coherent mode
No-ELM regime
description Electron cyclotron resonance heating (ECRH) staircase discharges in strongly shaped plasmas were performed at the full-tungsten ASDEX Upgrade tokamak to investigate the enhanced Dα (EDA) H-mode, a high-confinement regime without edge localized modes (ELMs) that exhibits numerous desirable qualities for future reactors. Heating power, fueling, and plasma current scans reveal rich dynamics as the plasma traverses different confinement regimes. The L-H transition typically occurs with a brief I-phase, sometimes followed by a short nonstationary ELM-free H-mode, before the quasi-coherent mode (QCM) sets in, marking the start of the EDA H-mode. After the pedestal fully develops, the plasma remains stationary until the heating power is raised above a certain threshold, causing ELMs. A novel criterion based on the normality of the divertor shunt current distribution is introduced to identify phases with ELMs, showing general applicability under a wide range of discharges and conditions. The no-ELM power boundary is found to increase with fueling, and too little deuterium gas puff results in a pathological nonstationary ELM-free H-mode without the QCM. Empirical scalings are derived for core, pedestal, and global parameters in EDA H-mode. These show, for example, that pedestal electron pressure increases sublinearly with power and almost quadratically with current. Line-averaged density is approximately proportional to plasma current but very weakly affected by power and fueling, whereas energy confinement time decreases sublinearly with power and increases supralinearly with current. The EDA H-mode achieves several reactor-relevant dimensionless parameters, most notably high Greenwald fraction and confinement enhancement factor over the entire heating power range. This dataset constitutes a versatile resource to plan EDA experiments in present and upcoming devices, also serving as a testbed for validating physics-based theories and models of the regime. Overall, the EDA H-mode remains promising and could become an important no-ELM scenario in future reactors such as SPARC and the full-tungsten ITER.
publishDate 2025
dc.date.none.fl_str_mv 2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/11441/172514
https://doi.org/10.1088/1741-4326/adb6bd
url https://hdl.handle.net/11441/172514
https://doi.org/10.1088/1741-4326/adb6bd
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Nuclear Fusion, 65 (4), 046002.
101052200
UIDB/50010/2020, LA/P/0061/2020
https://doi.org/10.1088/1741-4326/adb6bd
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 Ltd
publisher.none.fl_str_mv Iop Publishing Ltd
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 15,812429

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