The effect of heat load on divertor target by pumping in HL-2A Tokamak

BackgroundThe energy produced by nuclear fusion on a Tokamak device is mainly exhausted through the divertor, its service life is directly affected by the interaction between huge heat flux from core and the divertor target. The large amount of impurity produced by the heat flux hitting the target l...
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Autor*in:	WANG Zhe [verfasserIn] HUANG Qianhong [verfasserIn] TAN Qingyi [verfasserIn] YE Haoran [verfasserIn] CAO Chengzhi [verfasserIn]

Format:	E-Artikel
Sprache:	Chinesisch

Erschienen:	2022

Schlagwörter:	tokamak divertor detachment pumping edge plasma

Übergeordnetes Werk:	In: He jishu - Science Press, 2022, 45(2022), 10, Seite 100603-100603
Übergeordnetes Werk:	volume:45 ; year:2022 ; number:10 ; pages:100603-100603

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.11889/j.0253-3219.2022.hjs.45.100603

Katalog-ID:	DOAJ080870864

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245	1	4	\|a The effect of heat load on divertor target by pumping in HL-2A Tokamak
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520			\|a BackgroundThe energy produced by nuclear fusion on a Tokamak device is mainly exhausted through the divertor, its service life is directly affected by the interaction between huge heat flux from core and the divertor target. The large amount of impurity produced by the heat flux hitting the target leads to the reduction of the plasma confinement performance whilst pumping is an important means to control plasma density and impurity density.PurposeThis study aims to investigate the influence of pumping on the heat load of the target plate which is of reference significance for the future experiment.MethodsBased on the experimental parameters of the HL-2A Tokamak, SOLPS-ITER code was used to study the effect of pumping on the heat load of the divertor target under different upstream electron densities. Analysis was performed through density scanning to find the sensitive threshold whilst and atom-molecular collision process was applied to the effect of pumping on the distribution of plasma and neutral particle parameters in divertor region at different upstream electron density.ResultsDensity scanning results show that pumping near the detachment threshold (TetOSP~5 eV) has a greater effect on the thermal load of the target plate. When the pumping rate is 12 m3·s-1, 36 m3·s-1 and 96 m3·s-1 respectively, the miss threshold and thermal load peak of outer target plate are 1.11, 1.24, 1.39 and 1.37, 1.96, 2.54 times of those without pumping respectively.ConclusionIt is found that the decreases of deuterium molecular density results in the energy of the collision reaction power decreases when the upstream electron density exceeds the detachment threshold, leads to the increase of the temperature and energy flow of the plasma in the target plate.
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allfields	10.11889/j.0253-3219.2022.hjs.45.100603 doi (DE-627)DOAJ080870864 (DE-599)DOAJeb600d18e54f4de7adae895e7c354706 DE-627 ger DE-627 rakwb chi TK9001-9401 WANG Zhe verfasserin aut The effect of heat load on divertor target by pumping in HL-2A Tokamak 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier BackgroundThe energy produced by nuclear fusion on a Tokamak device is mainly exhausted through the divertor, its service life is directly affected by the interaction between huge heat flux from core and the divertor target. The large amount of impurity produced by the heat flux hitting the target leads to the reduction of the plasma confinement performance whilst pumping is an important means to control plasma density and impurity density.PurposeThis study aims to investigate the influence of pumping on the heat load of the target plate which is of reference significance for the future experiment.MethodsBased on the experimental parameters of the HL-2A Tokamak, SOLPS-ITER code was used to study the effect of pumping on the heat load of the divertor target under different upstream electron densities. Analysis was performed through density scanning to find the sensitive threshold whilst and atom-molecular collision process was applied to the effect of pumping on the distribution of plasma and neutral particle parameters in divertor region at different upstream electron density.ResultsDensity scanning results show that pumping near the detachment threshold (TetOSP~5 eV) has a greater effect on the thermal load of the target plate. When the pumping rate is 12 m3·s-1, 36 m3·s-1 and 96 m3·s-1 respectively, the miss threshold and thermal load peak of outer target plate are 1.11, 1.24, 1.39 and 1.37, 1.96, 2.54 times of those without pumping respectively.ConclusionIt is found that the decreases of deuterium molecular density results in the energy of the collision reaction power decreases when the upstream electron density exceeds the detachment threshold, leads to the increase of the temperature and energy flow of the plasma in the target plate. tokamak divertor detachment pumping edge plasma Nuclear engineering. Atomic power HUANG Qianhong verfasserin aut TAN Qingyi verfasserin aut YE Haoran verfasserin aut CAO Chengzhi verfasserin aut In He jishu Science Press, 2022 45(2022), 10, Seite 100603-100603 (DE-627)DOAJ078593506 02533219 nnns volume:45 year:2022 number:10 pages:100603-100603 https://doi.org/10.11889/j.0253-3219.2022.hjs.45.100603 kostenfrei https://doaj.org/article/eb600d18e54f4de7adae895e7c354706 kostenfrei https://www.hjs.sinap.ac.cn/thesisDetails#10.11889/j.0253-3219.2022.hjs.45.100603&lang=zh kostenfrei https://doaj.org/toc/0253-3219 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ AR 45 2022 10 100603-100603
spelling	10.11889/j.0253-3219.2022.hjs.45.100603 doi (DE-627)DOAJ080870864 (DE-599)DOAJeb600d18e54f4de7adae895e7c354706 DE-627 ger DE-627 rakwb chi TK9001-9401 WANG Zhe verfasserin aut The effect of heat load on divertor target by pumping in HL-2A Tokamak 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier BackgroundThe energy produced by nuclear fusion on a Tokamak device is mainly exhausted through the divertor, its service life is directly affected by the interaction between huge heat flux from core and the divertor target. The large amount of impurity produced by the heat flux hitting the target leads to the reduction of the plasma confinement performance whilst pumping is an important means to control plasma density and impurity density.PurposeThis study aims to investigate the influence of pumping on the heat load of the target plate which is of reference significance for the future experiment.MethodsBased on the experimental parameters of the HL-2A Tokamak, SOLPS-ITER code was used to study the effect of pumping on the heat load of the divertor target under different upstream electron densities. Analysis was performed through density scanning to find the sensitive threshold whilst and atom-molecular collision process was applied to the effect of pumping on the distribution of plasma and neutral particle parameters in divertor region at different upstream electron density.ResultsDensity scanning results show that pumping near the detachment threshold (TetOSP~5 eV) has a greater effect on the thermal load of the target plate. When the pumping rate is 12 m3·s-1, 36 m3·s-1 and 96 m3·s-1 respectively, the miss threshold and thermal load peak of outer target plate are 1.11, 1.24, 1.39 and 1.37, 1.96, 2.54 times of those without pumping respectively.ConclusionIt is found that the decreases of deuterium molecular density results in the energy of the collision reaction power decreases when the upstream electron density exceeds the detachment threshold, leads to the increase of the temperature and energy flow of the plasma in the target plate. tokamak divertor detachment pumping edge plasma Nuclear engineering. Atomic power HUANG Qianhong verfasserin aut TAN Qingyi verfasserin aut YE Haoran verfasserin aut CAO Chengzhi verfasserin aut In He jishu Science Press, 2022 45(2022), 10, Seite 100603-100603 (DE-627)DOAJ078593506 02533219 nnns volume:45 year:2022 number:10 pages:100603-100603 https://doi.org/10.11889/j.0253-3219.2022.hjs.45.100603 kostenfrei https://doaj.org/article/eb600d18e54f4de7adae895e7c354706 kostenfrei https://www.hjs.sinap.ac.cn/thesisDetails#10.11889/j.0253-3219.2022.hjs.45.100603&lang=zh kostenfrei https://doaj.org/toc/0253-3219 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ AR 45 2022 10 100603-100603
allfields_unstemmed	10.11889/j.0253-3219.2022.hjs.45.100603 doi (DE-627)DOAJ080870864 (DE-599)DOAJeb600d18e54f4de7adae895e7c354706 DE-627 ger DE-627 rakwb chi TK9001-9401 WANG Zhe verfasserin aut The effect of heat load on divertor target by pumping in HL-2A Tokamak 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier BackgroundThe energy produced by nuclear fusion on a Tokamak device is mainly exhausted through the divertor, its service life is directly affected by the interaction between huge heat flux from core and the divertor target. The large amount of impurity produced by the heat flux hitting the target leads to the reduction of the plasma confinement performance whilst pumping is an important means to control plasma density and impurity density.PurposeThis study aims to investigate the influence of pumping on the heat load of the target plate which is of reference significance for the future experiment.MethodsBased on the experimental parameters of the HL-2A Tokamak, SOLPS-ITER code was used to study the effect of pumping on the heat load of the divertor target under different upstream electron densities. Analysis was performed through density scanning to find the sensitive threshold whilst and atom-molecular collision process was applied to the effect of pumping on the distribution of plasma and neutral particle parameters in divertor region at different upstream electron density.ResultsDensity scanning results show that pumping near the detachment threshold (TetOSP~5 eV) has a greater effect on the thermal load of the target plate. When the pumping rate is 12 m3·s-1, 36 m3·s-1 and 96 m3·s-1 respectively, the miss threshold and thermal load peak of outer target plate are 1.11, 1.24, 1.39 and 1.37, 1.96, 2.54 times of those without pumping respectively.ConclusionIt is found that the decreases of deuterium molecular density results in the energy of the collision reaction power decreases when the upstream electron density exceeds the detachment threshold, leads to the increase of the temperature and energy flow of the plasma in the target plate. tokamak divertor detachment pumping edge plasma Nuclear engineering. Atomic power HUANG Qianhong verfasserin aut TAN Qingyi verfasserin aut YE Haoran verfasserin aut CAO Chengzhi verfasserin aut In He jishu Science Press, 2022 45(2022), 10, Seite 100603-100603 (DE-627)DOAJ078593506 02533219 nnns volume:45 year:2022 number:10 pages:100603-100603 https://doi.org/10.11889/j.0253-3219.2022.hjs.45.100603 kostenfrei https://doaj.org/article/eb600d18e54f4de7adae895e7c354706 kostenfrei https://www.hjs.sinap.ac.cn/thesisDetails#10.11889/j.0253-3219.2022.hjs.45.100603&lang=zh kostenfrei https://doaj.org/toc/0253-3219 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ AR 45 2022 10 100603-100603
allfieldsGer	10.11889/j.0253-3219.2022.hjs.45.100603 doi (DE-627)DOAJ080870864 (DE-599)DOAJeb600d18e54f4de7adae895e7c354706 DE-627 ger DE-627 rakwb chi TK9001-9401 WANG Zhe verfasserin aut The effect of heat load on divertor target by pumping in HL-2A Tokamak 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier BackgroundThe energy produced by nuclear fusion on a Tokamak device is mainly exhausted through the divertor, its service life is directly affected by the interaction between huge heat flux from core and the divertor target. The large amount of impurity produced by the heat flux hitting the target leads to the reduction of the plasma confinement performance whilst pumping is an important means to control plasma density and impurity density.PurposeThis study aims to investigate the influence of pumping on the heat load of the target plate which is of reference significance for the future experiment.MethodsBased on the experimental parameters of the HL-2A Tokamak, SOLPS-ITER code was used to study the effect of pumping on the heat load of the divertor target under different upstream electron densities. Analysis was performed through density scanning to find the sensitive threshold whilst and atom-molecular collision process was applied to the effect of pumping on the distribution of plasma and neutral particle parameters in divertor region at different upstream electron density.ResultsDensity scanning results show that pumping near the detachment threshold (TetOSP~5 eV) has a greater effect on the thermal load of the target plate. When the pumping rate is 12 m3·s-1, 36 m3·s-1 and 96 m3·s-1 respectively, the miss threshold and thermal load peak of outer target plate are 1.11, 1.24, 1.39 and 1.37, 1.96, 2.54 times of those without pumping respectively.ConclusionIt is found that the decreases of deuterium molecular density results in the energy of the collision reaction power decreases when the upstream electron density exceeds the detachment threshold, leads to the increase of the temperature and energy flow of the plasma in the target plate. tokamak divertor detachment pumping edge plasma Nuclear engineering. Atomic power HUANG Qianhong verfasserin aut TAN Qingyi verfasserin aut YE Haoran verfasserin aut CAO Chengzhi verfasserin aut In He jishu Science Press, 2022 45(2022), 10, Seite 100603-100603 (DE-627)DOAJ078593506 02533219 nnns volume:45 year:2022 number:10 pages:100603-100603 https://doi.org/10.11889/j.0253-3219.2022.hjs.45.100603 kostenfrei https://doaj.org/article/eb600d18e54f4de7adae895e7c354706 kostenfrei https://www.hjs.sinap.ac.cn/thesisDetails#10.11889/j.0253-3219.2022.hjs.45.100603&lang=zh kostenfrei https://doaj.org/toc/0253-3219 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ AR 45 2022 10 100603-100603
allfieldsSound	10.11889/j.0253-3219.2022.hjs.45.100603 doi (DE-627)DOAJ080870864 (DE-599)DOAJeb600d18e54f4de7adae895e7c354706 DE-627 ger DE-627 rakwb chi TK9001-9401 WANG Zhe verfasserin aut The effect of heat load on divertor target by pumping in HL-2A Tokamak 2022 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier BackgroundThe energy produced by nuclear fusion on a Tokamak device is mainly exhausted through the divertor, its service life is directly affected by the interaction between huge heat flux from core and the divertor target. The large amount of impurity produced by the heat flux hitting the target leads to the reduction of the plasma confinement performance whilst pumping is an important means to control plasma density and impurity density.PurposeThis study aims to investigate the influence of pumping on the heat load of the target plate which is of reference significance for the future experiment.MethodsBased on the experimental parameters of the HL-2A Tokamak, SOLPS-ITER code was used to study the effect of pumping on the heat load of the divertor target under different upstream electron densities. Analysis was performed through density scanning to find the sensitive threshold whilst and atom-molecular collision process was applied to the effect of pumping on the distribution of plasma and neutral particle parameters in divertor region at different upstream electron density.ResultsDensity scanning results show that pumping near the detachment threshold (TetOSP~5 eV) has a greater effect on the thermal load of the target plate. When the pumping rate is 12 m3·s-1, 36 m3·s-1 and 96 m3·s-1 respectively, the miss threshold and thermal load peak of outer target plate are 1.11, 1.24, 1.39 and 1.37, 1.96, 2.54 times of those without pumping respectively.ConclusionIt is found that the decreases of deuterium molecular density results in the energy of the collision reaction power decreases when the upstream electron density exceeds the detachment threshold, leads to the increase of the temperature and energy flow of the plasma in the target plate. tokamak divertor detachment pumping edge plasma Nuclear engineering. Atomic power HUANG Qianhong verfasserin aut TAN Qingyi verfasserin aut YE Haoran verfasserin aut CAO Chengzhi verfasserin aut In He jishu Science Press, 2022 45(2022), 10, Seite 100603-100603 (DE-627)DOAJ078593506 02533219 nnns volume:45 year:2022 number:10 pages:100603-100603 https://doi.org/10.11889/j.0253-3219.2022.hjs.45.100603 kostenfrei https://doaj.org/article/eb600d18e54f4de7adae895e7c354706 kostenfrei https://www.hjs.sinap.ac.cn/thesisDetails#10.11889/j.0253-3219.2022.hjs.45.100603&lang=zh kostenfrei https://doaj.org/toc/0253-3219 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ AR 45 2022 10 100603-100603
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The large amount of impurity produced by the heat flux hitting the target leads to the reduction of the plasma confinement performance whilst pumping is an important means to control plasma density and impurity density.PurposeThis study aims to investigate the influence of pumping on the heat load of the target plate which is of reference significance for the future experiment.MethodsBased on the experimental parameters of the HL-2A Tokamak, SOLPS-ITER code was used to study the effect of pumping on the heat load of the divertor target under different upstream electron densities. Analysis was performed through density scanning to find the sensitive threshold whilst and atom-molecular collision process was applied to the effect of pumping on the distribution of plasma and neutral particle parameters in divertor region at different upstream electron density.ResultsDensity scanning results show that pumping near the detachment threshold (TetOSP~5 eV) has a greater effect on the thermal load of the target plate. When the pumping rate is 12 m3·s-1, 36 m3·s-1 and 96 m3·s-1 respectively, the miss threshold and thermal load peak of outer target plate are 1.11, 1.24, 1.39 and 1.37, 1.96, 2.54 times of those without pumping respectively.ConclusionIt is found that the decreases of deuterium molecular density results in the energy of the collision reaction power decreases when the upstream electron density exceeds the detachment threshold, leads to the increase of the temperature and energy flow of the plasma in the target plate.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">tokamak</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">divertor detachment</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">pumping</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">edge plasma</subfield></datafield><datafield tag="653" ind1=" " ind2="0"><subfield code="a">Nuclear engineering. 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topic_title	TK9001-9401 The effect of heat load on divertor target by pumping in HL-2A Tokamak tokamak divertor detachment pumping edge plasma
topic	misc TK9001-9401 misc tokamak misc divertor detachment misc pumping misc edge plasma misc Nuclear engineering. Atomic power
topic_unstemmed	misc TK9001-9401 misc tokamak misc divertor detachment misc pumping misc edge plasma misc Nuclear engineering. Atomic power
topic_browse	misc TK9001-9401 misc tokamak misc divertor detachment misc pumping misc edge plasma misc Nuclear engineering. Atomic power
format_facet	Elektronische Aufsätze Aufsätze Elektronische Ressource
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title	The effect of heat load on divertor target by pumping in HL-2A Tokamak
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title_full	The effect of heat load on divertor target by pumping in HL-2A Tokamak
author_sort	WANG Zhe
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author_browse	WANG Zhe HUANG Qianhong TAN Qingyi YE Haoran CAO Chengzhi
container_volume	45
class	TK9001-9401
format_se	Elektronische Aufsätze
author-letter	WANG Zhe
doi_str_mv	10.11889/j.0253-3219.2022.hjs.45.100603
author2-role	verfasserin
title_sort	effect of heat load on divertor target by pumping in hl-2a tokamak
callnumber	TK9001-9401
title_auth	The effect of heat load on divertor target by pumping in HL-2A Tokamak
abstract	BackgroundThe energy produced by nuclear fusion on a Tokamak device is mainly exhausted through the divertor, its service life is directly affected by the interaction between huge heat flux from core and the divertor target. The large amount of impurity produced by the heat flux hitting the target leads to the reduction of the plasma confinement performance whilst pumping is an important means to control plasma density and impurity density.PurposeThis study aims to investigate the influence of pumping on the heat load of the target plate which is of reference significance for the future experiment.MethodsBased on the experimental parameters of the HL-2A Tokamak, SOLPS-ITER code was used to study the effect of pumping on the heat load of the divertor target under different upstream electron densities. Analysis was performed through density scanning to find the sensitive threshold whilst and atom-molecular collision process was applied to the effect of pumping on the distribution of plasma and neutral particle parameters in divertor region at different upstream electron density.ResultsDensity scanning results show that pumping near the detachment threshold (TetOSP~5 eV) has a greater effect on the thermal load of the target plate. When the pumping rate is 12 m3·s-1, 36 m3·s-1 and 96 m3·s-1 respectively, the miss threshold and thermal load peak of outer target plate are 1.11, 1.24, 1.39 and 1.37, 1.96, 2.54 times of those without pumping respectively.ConclusionIt is found that the decreases of deuterium molecular density results in the energy of the collision reaction power decreases when the upstream electron density exceeds the detachment threshold, leads to the increase of the temperature and energy flow of the plasma in the target plate.
abstractGer	BackgroundThe energy produced by nuclear fusion on a Tokamak device is mainly exhausted through the divertor, its service life is directly affected by the interaction between huge heat flux from core and the divertor target. The large amount of impurity produced by the heat flux hitting the target leads to the reduction of the plasma confinement performance whilst pumping is an important means to control plasma density and impurity density.PurposeThis study aims to investigate the influence of pumping on the heat load of the target plate which is of reference significance for the future experiment.MethodsBased on the experimental parameters of the HL-2A Tokamak, SOLPS-ITER code was used to study the effect of pumping on the heat load of the divertor target under different upstream electron densities. Analysis was performed through density scanning to find the sensitive threshold whilst and atom-molecular collision process was applied to the effect of pumping on the distribution of plasma and neutral particle parameters in divertor region at different upstream electron density.ResultsDensity scanning results show that pumping near the detachment threshold (TetOSP~5 eV) has a greater effect on the thermal load of the target plate. When the pumping rate is 12 m3·s-1, 36 m3·s-1 and 96 m3·s-1 respectively, the miss threshold and thermal load peak of outer target plate are 1.11, 1.24, 1.39 and 1.37, 1.96, 2.54 times of those without pumping respectively.ConclusionIt is found that the decreases of deuterium molecular density results in the energy of the collision reaction power decreases when the upstream electron density exceeds the detachment threshold, leads to the increase of the temperature and energy flow of the plasma in the target plate.
abstract_unstemmed	BackgroundThe energy produced by nuclear fusion on a Tokamak device is mainly exhausted through the divertor, its service life is directly affected by the interaction between huge heat flux from core and the divertor target. The large amount of impurity produced by the heat flux hitting the target leads to the reduction of the plasma confinement performance whilst pumping is an important means to control plasma density and impurity density.PurposeThis study aims to investigate the influence of pumping on the heat load of the target plate which is of reference significance for the future experiment.MethodsBased on the experimental parameters of the HL-2A Tokamak, SOLPS-ITER code was used to study the effect of pumping on the heat load of the divertor target under different upstream electron densities. Analysis was performed through density scanning to find the sensitive threshold whilst and atom-molecular collision process was applied to the effect of pumping on the distribution of plasma and neutral particle parameters in divertor region at different upstream electron density.ResultsDensity scanning results show that pumping near the detachment threshold (TetOSP~5 eV) has a greater effect on the thermal load of the target plate. When the pumping rate is 12 m3·s-1, 36 m3·s-1 and 96 m3·s-1 respectively, the miss threshold and thermal load peak of outer target plate are 1.11, 1.24, 1.39 and 1.37, 1.96, 2.54 times of those without pumping respectively.ConclusionIt is found that the decreases of deuterium molecular density results in the energy of the collision reaction power decreases when the upstream electron density exceeds the detachment threshold, leads to the increase of the temperature and energy flow of the plasma in the target plate.
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title_short	The effect of heat load on divertor target by pumping in HL-2A Tokamak
url	https://doi.org/10.11889/j.0253-3219.2022.hjs.45.100603 https://doaj.org/article/eb600d18e54f4de7adae895e7c354706 https://www.hjs.sinap.ac.cn/thesisDetails#10.11889/j.0253-3219.2022.hjs.45.100603&lang=zh https://doaj.org/toc/0253-3219
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author2	HUANG Qianhong TAN Qingyi YE Haoran CAO Chengzhi
author2Str	HUANG Qianhong TAN Qingyi YE Haoran CAO Chengzhi
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doi_str	10.11889/j.0253-3219.2022.hjs.45.100603
callnumber-a	TK9001-9401
up_date	2024-07-03T16:59:41.603Z
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The large amount of impurity produced by the heat flux hitting the target leads to the reduction of the plasma confinement performance whilst pumping is an important means to control plasma density and impurity density.PurposeThis study aims to investigate the influence of pumping on the heat load of the target plate which is of reference significance for the future experiment.MethodsBased on the experimental parameters of the HL-2A Tokamak, SOLPS-ITER code was used to study the effect of pumping on the heat load of the divertor target under different upstream electron densities. Analysis was performed through density scanning to find the sensitive threshold whilst and atom-molecular collision process was applied to the effect of pumping on the distribution of plasma and neutral particle parameters in divertor region at different upstream electron density.ResultsDensity scanning results show that pumping near the detachment threshold (TetOSP~5 eV) has a greater effect on the thermal load of the target plate. 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