Effective control of intrinsic impurities using n = 1 resonant magnetic perturbation (RMP) in EAST H-mode plasma

Autores
Zhang, Wenmin; Zhang, Ling; Morita, Shigeru; Cheng, Yunxin; Sheng, Hui; Zhou, Chengxi; Wang, Huihui; Sun, Youwen; Chu, Yuqi; Sun, Ning; Hu, Ailan; Mitnik, Dario Marcelo; Jie, Yinxian; Liu, Haiqing
Año de publicación
2024
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Since 2021, EAST tokamak has been operated with full tungsten divertors. Tungsten accumulation has beenfrequently observed in NBI-heated H-mode discharges, resulting in the degradation of plasma confinementperformance. Control of tungsten impurity is thus critical for the maintenance of high-confinement plasmas. Inthis work the impact of the n = 1 resonant magnetic perturbation (RMP) on the behavior of intrinsic low- andhigh-Z impurities in EAST H-mode discharges are experimentally studied, utilizing high-performance extremeultraviolet spectroscopic diagnostics. In the dedicated discharge, ELM mitigation, ELM suppression, H-L backtransition, RMP penetration occurs in succession with increasing RMP current (IRMP). When IRMP is below thethreshold for H-L back transition, IRMP_H-L = 2.29 kA, increasing influx of C2+ and C3+ ions and decreasing influxof C4+ and C5+ ions are observed simutaneously with enhancement of the RMP field. This opposite time behaviorin the influx of C4+ and C 3+ ion is then observed to be magnified during the RMP penetration phase. It indicates aimpurity screening layer formed between the locations where C4+ and C3+ ions distribute during RMP appli­cation based on our previous analysis (W.M. Zhang et al 2024 Nucl. Fusion 64 086004). A large step of increase inC4+ influx after H-L back transition indicates C4+ ion mainly located at bottom of pedestal. A higher RMP coilcurrents threshold capable of impurity screening is found for high-Z impurity ions of Cu25+, Mo30+, W42+, i. e.0.53–0.75 kA, than that for C4+ and C5+, i. e. 0.33 kA. Meanwhile, it is found that comparing to C4+ and C5+ ionsthe decontamination effect by this impurity screening layer is more efficient for these high-Z impurity ions inplasma core region, e.g. up to 70 % reduction in the impurity density, leading to a significant reduction of ra­diation power. Furthermore, the continuous reduction of core high-Z impurities level both in ELM mitigation andsuppression phase proved that this impurity decontamination effect by RMP field is dominant over the impact ofELM activity to core high-Z impurities transport since tungsten is frequently observed to accumulate duringoriginal ELM-free phase. Experimental results from this work would contribute to further understanding of theunderlying mechanism how the RMP field impacts the impurity transport.
Fil: Zhang, Wenmin. Chinese Academy of Sciences; República de China
Fil: Zhang, Ling. Chinese Academy of Sciences; República de China
Fil: Morita, Shigeru. National Institute for Fusion Science; Japón
Fil: Cheng, Yunxin. Chinese Academy of Sciences; República de China
Fil: Sheng, Hui. Chinese Academy of Sciences; República de China
Fil: Zhou, Chengxi. Chinese Academy of Sciences; República de China
Fil: Wang, Huihui. Chinese Academy of Sciences; República de China
Fil: Sun, Youwen. Chinese Academy of Sciences; República de China
Fil: Chu, Yuqi. Chinese Academy of Sciences; República de China
Fil: Sun, Ning. Chinese Academy of Sciences; República de China
Fil: Hu, Ailan. Chinese Academy of Sciences; República de China
Fil: Mitnik, Dario Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Jie, Yinxian. Chinese Academy of Sciences; República de China
Fil: Liu, Haiqing. Chinese Academy of Sciences; República de China
Materia
EAST plasma
impurity screening layer
impurity influx
resonant magnetic perturbation
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/263138
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/263138
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Effective control of intrinsic impurities using n = 1 resonant magnetic perturbation (RMP) in EAST H-mode plasmaZhang, WenminZhang, LingMorita, ShigeruCheng, YunxinSheng, HuiZhou, ChengxiWang, HuihuiSun, YouwenChu, YuqiSun, NingHu, AilanMitnik, Dario MarceloJie, YinxianLiu, HaiqingEAST plasmaimpurity screening layerimpurity influxresonant magnetic perturbationhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Since 2021, EAST tokamak has been operated with full tungsten divertors. Tungsten accumulation has beenfrequently observed in NBI-heated H-mode discharges, resulting in the degradation of plasma confinementperformance. Control of tungsten impurity is thus critical for the maintenance of high-confinement plasmas. Inthis work the impact of the n = 1 resonant magnetic perturbation (RMP) on the behavior of intrinsic low- andhigh-Z impurities in EAST H-mode discharges are experimentally studied, utilizing high-performance extremeultraviolet spectroscopic diagnostics. In the dedicated discharge, ELM mitigation, ELM suppression, H-L backtransition, RMP penetration occurs in succession with increasing RMP current (IRMP). When IRMP is below thethreshold for H-L back transition, IRMP_H-L = 2.29 kA, increasing influx of C2+ and C3+ ions and decreasing influxof C4+ and C5+ ions are observed simutaneously with enhancement of the RMP field. This opposite time behaviorin the influx of C4+ and C 3+ ion is then observed to be magnified during the RMP penetration phase. It indicates aimpurity screening layer formed between the locations where C4+ and C3+ ions distribute during RMP appli­cation based on our previous analysis (W.M. Zhang et al 2024 Nucl. Fusion 64 086004). A large step of increase inC4+ influx after H-L back transition indicates C4+ ion mainly located at bottom of pedestal. A higher RMP coilcurrents threshold capable of impurity screening is found for high-Z impurity ions of Cu25+, Mo30+, W42+, i. e.0.53–0.75 kA, than that for C4+ and C5+, i. e. 0.33 kA. Meanwhile, it is found that comparing to C4+ and C5+ ionsthe decontamination effect by this impurity screening layer is more efficient for these high-Z impurity ions inplasma core region, e.g. up to 70 % reduction in the impurity density, leading to a significant reduction of ra­diation power. Furthermore, the continuous reduction of core high-Z impurities level both in ELM mitigation andsuppression phase proved that this impurity decontamination effect by RMP field is dominant over the impact ofELM activity to core high-Z impurities transport since tungsten is frequently observed to accumulate duringoriginal ELM-free phase. Experimental results from this work would contribute to further understanding of theunderlying mechanism how the RMP field impacts the impurity transport.Fil: Zhang, Wenmin. Chinese Academy of Sciences; República de ChinaFil: Zhang, Ling. Chinese Academy of Sciences; República de ChinaFil: Morita, Shigeru. National Institute for Fusion Science; JapónFil: Cheng, Yunxin. Chinese Academy of Sciences; República de ChinaFil: Sheng, Hui. Chinese Academy of Sciences; República de ChinaFil: Zhou, Chengxi. Chinese Academy of Sciences; República de ChinaFil: Wang, Huihui. Chinese Academy of Sciences; República de ChinaFil: Sun, Youwen. Chinese Academy of Sciences; República de ChinaFil: Chu, Yuqi. Chinese Academy of Sciences; República de ChinaFil: Sun, Ning. Chinese Academy of Sciences; República de ChinaFil: Hu, Ailan. Chinese Academy of Sciences; República de ChinaFil: Mitnik, Dario Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Jie, Yinxian. Chinese Academy of Sciences; República de ChinaFil: Liu, Haiqing. Chinese Academy of Sciences; República de ChinaElsevier2024-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/263138Zhang, Wenmin; Zhang, Ling; Morita, Shigeru; Cheng, Yunxin; Sheng, Hui; et al.; Effective control of intrinsic impurities using n = 1 resonant magnetic perturbation (RMP) in EAST H-mode plasma; Elsevier; Nuclear Materials and Energy; 41; 12-2024; 101822-1018272352-1791CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://linkinghub.elsevier.com/retrieve/pii/S235217912400245Xinfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.nme.2024.101822info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T15:23:54Zoai:ri.conicet.gov.ar:11336/263138instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-15 15:23:55.217CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Effective control of intrinsic impurities using n = 1 resonant magnetic perturbation (RMP) in EAST H-mode plasma
title Effective control of intrinsic impurities using n = 1 resonant magnetic perturbation (RMP) in EAST H-mode plasma
spellingShingle Effective control of intrinsic impurities using n = 1 resonant magnetic perturbation (RMP) in EAST H-mode plasma
Zhang, Wenmin
EAST plasma
impurity screening layer
impurity influx
resonant magnetic perturbation
title_short Effective control of intrinsic impurities using n = 1 resonant magnetic perturbation (RMP) in EAST H-mode plasma
title_full Effective control of intrinsic impurities using n = 1 resonant magnetic perturbation (RMP) in EAST H-mode plasma
title_fullStr Effective control of intrinsic impurities using n = 1 resonant magnetic perturbation (RMP) in EAST H-mode plasma
title_full_unstemmed Effective control of intrinsic impurities using n = 1 resonant magnetic perturbation (RMP) in EAST H-mode plasma
title_sort Effective control of intrinsic impurities using n = 1 resonant magnetic perturbation (RMP) in EAST H-mode plasma
dc.creator.none.fl_str_mv Zhang, Wenmin
Zhang, Ling
Morita, Shigeru
Cheng, Yunxin
Sheng, Hui
Zhou, Chengxi
Wang, Huihui
Sun, Youwen
Chu, Yuqi
Sun, Ning
Hu, Ailan
Mitnik, Dario Marcelo
Jie, Yinxian
Liu, Haiqing
author Zhang, Wenmin
author_facet Zhang, Wenmin
Zhang, Ling
Morita, Shigeru
Cheng, Yunxin
Sheng, Hui
Zhou, Chengxi
Wang, Huihui
Sun, Youwen
Chu, Yuqi
Sun, Ning
Hu, Ailan
Mitnik, Dario Marcelo
Jie, Yinxian
Liu, Haiqing
author_role author
author2 Zhang, Ling
Morita, Shigeru
Cheng, Yunxin
Sheng, Hui
Zhou, Chengxi
Wang, Huihui
Sun, Youwen
Chu, Yuqi
Sun, Ning
Hu, Ailan
Mitnik, Dario Marcelo
Jie, Yinxian
Liu, Haiqing
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv EAST plasma
impurity screening layer
impurity influx
resonant magnetic perturbation
topic EAST plasma
impurity screening layer
impurity influx
resonant magnetic perturbation
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Since 2021, EAST tokamak has been operated with full tungsten divertors. Tungsten accumulation has beenfrequently observed in NBI-heated H-mode discharges, resulting in the degradation of plasma confinementperformance. Control of tungsten impurity is thus critical for the maintenance of high-confinement plasmas. Inthis work the impact of the n = 1 resonant magnetic perturbation (RMP) on the behavior of intrinsic low- andhigh-Z impurities in EAST H-mode discharges are experimentally studied, utilizing high-performance extremeultraviolet spectroscopic diagnostics. In the dedicated discharge, ELM mitigation, ELM suppression, H-L backtransition, RMP penetration occurs in succession with increasing RMP current (IRMP). When IRMP is below thethreshold for H-L back transition, IRMP_H-L = 2.29 kA, increasing influx of C2+ and C3+ ions and decreasing influxof C4+ and C5+ ions are observed simutaneously with enhancement of the RMP field. This opposite time behaviorin the influx of C4+ and C 3+ ion is then observed to be magnified during the RMP penetration phase. It indicates aimpurity screening layer formed between the locations where C4+ and C3+ ions distribute during RMP appli­cation based on our previous analysis (W.M. Zhang et al 2024 Nucl. Fusion 64 086004). A large step of increase inC4+ influx after H-L back transition indicates C4+ ion mainly located at bottom of pedestal. A higher RMP coilcurrents threshold capable of impurity screening is found for high-Z impurity ions of Cu25+, Mo30+, W42+, i. e.0.53–0.75 kA, than that for C4+ and C5+, i. e. 0.33 kA. Meanwhile, it is found that comparing to C4+ and C5+ ionsthe decontamination effect by this impurity screening layer is more efficient for these high-Z impurity ions inplasma core region, e.g. up to 70 % reduction in the impurity density, leading to a significant reduction of ra­diation power. Furthermore, the continuous reduction of core high-Z impurities level both in ELM mitigation andsuppression phase proved that this impurity decontamination effect by RMP field is dominant over the impact ofELM activity to core high-Z impurities transport since tungsten is frequently observed to accumulate duringoriginal ELM-free phase. Experimental results from this work would contribute to further understanding of theunderlying mechanism how the RMP field impacts the impurity transport.
Fil: Zhang, Wenmin. Chinese Academy of Sciences; República de China
Fil: Zhang, Ling. Chinese Academy of Sciences; República de China
Fil: Morita, Shigeru. National Institute for Fusion Science; Japón
Fil: Cheng, Yunxin. Chinese Academy of Sciences; República de China
Fil: Sheng, Hui. Chinese Academy of Sciences; República de China
Fil: Zhou, Chengxi. Chinese Academy of Sciences; República de China
Fil: Wang, Huihui. Chinese Academy of Sciences; República de China
Fil: Sun, Youwen. Chinese Academy of Sciences; República de China
Fil: Chu, Yuqi. Chinese Academy of Sciences; República de China
Fil: Sun, Ning. Chinese Academy of Sciences; República de China
Fil: Hu, Ailan. Chinese Academy of Sciences; República de China
Fil: Mitnik, Dario Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Jie, Yinxian. Chinese Academy of Sciences; República de China
Fil: Liu, Haiqing. Chinese Academy of Sciences; República de China
description Since 2021, EAST tokamak has been operated with full tungsten divertors. Tungsten accumulation has beenfrequently observed in NBI-heated H-mode discharges, resulting in the degradation of plasma confinementperformance. Control of tungsten impurity is thus critical for the maintenance of high-confinement plasmas. Inthis work the impact of the n = 1 resonant magnetic perturbation (RMP) on the behavior of intrinsic low- andhigh-Z impurities in EAST H-mode discharges are experimentally studied, utilizing high-performance extremeultraviolet spectroscopic diagnostics. In the dedicated discharge, ELM mitigation, ELM suppression, H-L backtransition, RMP penetration occurs in succession with increasing RMP current (IRMP). When IRMP is below thethreshold for H-L back transition, IRMP_H-L = 2.29 kA, increasing influx of C2+ and C3+ ions and decreasing influxof C4+ and C5+ ions are observed simutaneously with enhancement of the RMP field. This opposite time behaviorin the influx of C4+ and C 3+ ion is then observed to be magnified during the RMP penetration phase. It indicates aimpurity screening layer formed between the locations where C4+ and C3+ ions distribute during RMP appli­cation based on our previous analysis (W.M. Zhang et al 2024 Nucl. Fusion 64 086004). A large step of increase inC4+ influx after H-L back transition indicates C4+ ion mainly located at bottom of pedestal. A higher RMP coilcurrents threshold capable of impurity screening is found for high-Z impurity ions of Cu25+, Mo30+, W42+, i. e.0.53–0.75 kA, than that for C4+ and C5+, i. e. 0.33 kA. Meanwhile, it is found that comparing to C4+ and C5+ ionsthe decontamination effect by this impurity screening layer is more efficient for these high-Z impurity ions inplasma core region, e.g. up to 70 % reduction in the impurity density, leading to a significant reduction of ra­diation power. Furthermore, the continuous reduction of core high-Z impurities level both in ELM mitigation andsuppression phase proved that this impurity decontamination effect by RMP field is dominant over the impact ofELM activity to core high-Z impurities transport since tungsten is frequently observed to accumulate duringoriginal ELM-free phase. Experimental results from this work would contribute to further understanding of theunderlying mechanism how the RMP field impacts the impurity transport.
publishDate 2024
dc.date.none.fl_str_mv 2024-12
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/263138
Zhang, Wenmin; Zhang, Ling; Morita, Shigeru; Cheng, Yunxin; Sheng, Hui; et al.; Effective control of intrinsic impurities using n = 1 resonant magnetic perturbation (RMP) in EAST H-mode plasma; Elsevier; Nuclear Materials and Energy; 41; 12-2024; 101822-101827
2352-1791
CONICET Digital
CONICET
url http://hdl.handle.net/11336/263138
identifier_str_mv Zhang, Wenmin; Zhang, Ling; Morita, Shigeru; Cheng, Yunxin; Sheng, Hui; et al.; Effective control of intrinsic impurities using n = 1 resonant magnetic perturbation (RMP) in EAST H-mode plasma; Elsevier; Nuclear Materials and Energy; 41; 12-2024; 101822-101827
2352-1791
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://linkinghub.elsevier.com/retrieve/pii/S235217912400245X
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.nme.2024.101822
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.22299

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