First demonstration of radiative power exhaust with impurity seeding in the island divertor at Wendelstein 7-X
International audience Radiative power exhaust by impurity seeding was demonstrated for the first time in island divertor configurations at the stellarator Wendelstein 7-X. Feasibility of stable plasma operation was shown during seeding with both neon (Ne) and nitrogen (N2). High radiative power los...
Published in: | Nuclear Fusion |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2019
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Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-03740994 https://hal.archives-ouvertes.fr/hal-03740994/document https://hal.archives-ouvertes.fr/hal-03740994/file/w7x-impurity-seeding-power-exhaust-florian-effenberg.pdf https://doi.org/10.1088/1741-4326/ab32c4 |
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ftunivnantes:oai:HAL:hal-03740994v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
stellarator scrape-off layer island divertor power exhaust impurity seeding detachment [PHYS.PHYS]Physics [physics]/Physics [physics] [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] [PHYS.HIST]Physics [physics]/Physics archives [SPI.PLASMA]Engineering Sciences [physics]/Plasmas |
spellingShingle |
stellarator scrape-off layer island divertor power exhaust impurity seeding detachment [PHYS.PHYS]Physics [physics]/Physics [physics] [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] [PHYS.HIST]Physics [physics]/Physics archives [SPI.PLASMA]Engineering Sciences [physics]/Plasmas Effenberg, Florian Brezinsek, S. Feng, Y. König, R. Krychowiak, M. Jakubowski, M. Niemann, H. Perseo, V. Schmitz, O. Zhang, D. Barbui, T. Biedermann, C. Burhenn, R. Buttenschön, B. Kocsis, G. Pavone, A. Reimold, F. Szepesi, T. Frerichs, H. Gao, Y. Hergenhahn, U. Kwak, S. Otte, M. Pedersen, T. Sunn First demonstration of radiative power exhaust with impurity seeding in the island divertor at Wendelstein 7-X |
topic_facet |
stellarator scrape-off layer island divertor power exhaust impurity seeding detachment [PHYS.PHYS]Physics [physics]/Physics [physics] [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] [PHYS.HIST]Physics [physics]/Physics archives [SPI.PLASMA]Engineering Sciences [physics]/Plasmas |
description |
International audience Radiative power exhaust by impurity seeding was demonstrated for the first time in island divertor configurations at the stellarator Wendelstein 7-X. Feasibility of stable plasma operation was shown during seeding with both neon (Ne) and nitrogen (N2). High radiative power losses (80%) were found to reduce the divertor heat loads globally by 2/3 with both seeding gases injected at a single toroidal location into one of five magnetic islands. Heat flux detachment was achieved for the price of a loss of 15 % in the stored energy. Ne seeding allows for sustained enhancement of edge radiation with a very slow decay of line emission of several tens of seconds after the end of the injection indicating a high recycling of this noble gas at the carbon main plasma facing components. In N2 seeded discharges it is shown that a response of line emission and plasma parameters is in correlation to the puff duration which indicates a higher level of absorption of this seeding gas in the wall. Continuous N2 seeding results in global cooling of the scrape-off layer (SOL) and decay of radiation over several seconds after the injection. Damping of counter-streaming SOL flows, and divertor particle fluxes induced by Ne and N2 seeding have been measured and provide evidence for a reduction of the convective part of the divertor heat fluxes. Losses in density in response to seeding can be compensated by feedback controlled divertor fueling. The controlled reduction of heat fluxes within this complex 3D edge island geometry is a very promising finding concerning detachment control in a future all-metal divertor. L'échappement de puissance radiative par ensemencement d'impuretés a été démontré pour la première fois dans des configurations de divertor en îlot au stellarator Wendelstein 7-X. La faisabilité d'un fonctionnement plasma stable a été démontrée lors de l'ensemencement avec du néon (Ne) et de l'azote (N2). Il a été constaté que des pertes de puissance radiative élevées (80%) réduisaient globalement ... |
author2 |
Princeton Plasma Physics Laboratory (PPPL) Princeton University Institute of Energy and Climate Research - Plasma Physics (IEK-4) Forschungszentrum Jülich GmbH Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association Max-Planck-Institut für Plasmaphysik Garching (IPP) University of Wisconsin-Madison Wigner Research Centre for Physics Budapest Hungarian Academy of Sciences (MTA) Korea Advanced Institute of Science and Technology (KAIST) |
format |
Article in Journal/Newspaper |
author |
Effenberg, Florian Brezinsek, S. Feng, Y. König, R. Krychowiak, M. Jakubowski, M. Niemann, H. Perseo, V. Schmitz, O. Zhang, D. Barbui, T. Biedermann, C. Burhenn, R. Buttenschön, B. Kocsis, G. Pavone, A. Reimold, F. Szepesi, T. Frerichs, H. Gao, Y. Hergenhahn, U. Kwak, S. Otte, M. Pedersen, T. Sunn |
author_facet |
Effenberg, Florian Brezinsek, S. Feng, Y. König, R. Krychowiak, M. Jakubowski, M. Niemann, H. Perseo, V. Schmitz, O. Zhang, D. Barbui, T. Biedermann, C. Burhenn, R. Buttenschön, B. Kocsis, G. Pavone, A. Reimold, F. Szepesi, T. Frerichs, H. Gao, Y. Hergenhahn, U. Kwak, S. Otte, M. Pedersen, T. Sunn |
author_sort |
Effenberg, Florian |
title |
First demonstration of radiative power exhaust with impurity seeding in the island divertor at Wendelstein 7-X |
title_short |
First demonstration of radiative power exhaust with impurity seeding in the island divertor at Wendelstein 7-X |
title_full |
First demonstration of radiative power exhaust with impurity seeding in the island divertor at Wendelstein 7-X |
title_fullStr |
First demonstration of radiative power exhaust with impurity seeding in the island divertor at Wendelstein 7-X |
title_full_unstemmed |
First demonstration of radiative power exhaust with impurity seeding in the island divertor at Wendelstein 7-X |
title_sort |
first demonstration of radiative power exhaust with impurity seeding in the island divertor at wendelstein 7-x |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.archives-ouvertes.fr/hal-03740994 https://hal.archives-ouvertes.fr/hal-03740994/document https://hal.archives-ouvertes.fr/hal-03740994/file/w7x-impurity-seeding-power-exhaust-florian-effenberg.pdf https://doi.org/10.1088/1741-4326/ab32c4 |
genre |
Edge Island |
genre_facet |
Edge Island |
op_source |
ISSN: 0029-5515 EISSN: 1741-4326 Nuclear Fusion https://hal.archives-ouvertes.fr/hal-03740994 Nuclear Fusion, IOP Publishing, 2019, 59 (10), pp.106020. ⟨10.1088/1741-4326/ab32c4⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1088/1741-4326/ab32c4 hal-03740994 https://hal.archives-ouvertes.fr/hal-03740994 https://hal.archives-ouvertes.fr/hal-03740994/document https://hal.archives-ouvertes.fr/hal-03740994/file/w7x-impurity-seeding-power-exhaust-florian-effenberg.pdf doi:10.1088/1741-4326/ab32c4 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1088/1741-4326/ab32c4 |
container_title |
Nuclear Fusion |
container_volume |
59 |
container_issue |
10 |
container_start_page |
106020 |
_version_ |
1766399743984926720 |
spelling |
ftunivnantes:oai:HAL:hal-03740994v1 2023-05-15T16:04:03+02:00 First demonstration of radiative power exhaust with impurity seeding in the island divertor at Wendelstein 7-X Première démonstration d'extraction de puissance radiative avec ensemencement d'impuretés dans le divertor en îlot de Wendelstein 7-X Effenberg, Florian Brezinsek, S. Feng, Y. König, R. Krychowiak, M. Jakubowski, M. Niemann, H. Perseo, V. Schmitz, O. Zhang, D. Barbui, T. Biedermann, C. Burhenn, R. Buttenschön, B. Kocsis, G. Pavone, A. Reimold, F. Szepesi, T. Frerichs, H. Gao, Y. Hergenhahn, U. Kwak, S. Otte, M. Pedersen, T. Sunn Princeton Plasma Physics Laboratory (PPPL) Princeton University Institute of Energy and Climate Research - Plasma Physics (IEK-4) Forschungszentrum Jülich GmbH Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association Max-Planck-Institut für Plasmaphysik Garching (IPP) University of Wisconsin-Madison Wigner Research Centre for Physics Budapest Hungarian Academy of Sciences (MTA) Korea Advanced Institute of Science and Technology (KAIST) 2019-07-16 https://hal.archives-ouvertes.fr/hal-03740994 https://hal.archives-ouvertes.fr/hal-03740994/document https://hal.archives-ouvertes.fr/hal-03740994/file/w7x-impurity-seeding-power-exhaust-florian-effenberg.pdf https://doi.org/10.1088/1741-4326/ab32c4 en eng HAL CCSD IOP Publishing info:eu-repo/semantics/altIdentifier/doi/10.1088/1741-4326/ab32c4 hal-03740994 https://hal.archives-ouvertes.fr/hal-03740994 https://hal.archives-ouvertes.fr/hal-03740994/document https://hal.archives-ouvertes.fr/hal-03740994/file/w7x-impurity-seeding-power-exhaust-florian-effenberg.pdf doi:10.1088/1741-4326/ab32c4 info:eu-repo/semantics/OpenAccess ISSN: 0029-5515 EISSN: 1741-4326 Nuclear Fusion https://hal.archives-ouvertes.fr/hal-03740994 Nuclear Fusion, IOP Publishing, 2019, 59 (10), pp.106020. ⟨10.1088/1741-4326/ab32c4⟩ stellarator scrape-off layer island divertor power exhaust impurity seeding detachment [PHYS.PHYS]Physics [physics]/Physics [physics] [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] [PHYS.HIST]Physics [physics]/Physics archives [SPI.PLASMA]Engineering Sciences [physics]/Plasmas info:eu-repo/semantics/article Journal articles 2019 ftunivnantes https://doi.org/10.1088/1741-4326/ab32c4 2022-11-23T00:30:12Z International audience Radiative power exhaust by impurity seeding was demonstrated for the first time in island divertor configurations at the stellarator Wendelstein 7-X. Feasibility of stable plasma operation was shown during seeding with both neon (Ne) and nitrogen (N2). High radiative power losses (80%) were found to reduce the divertor heat loads globally by 2/3 with both seeding gases injected at a single toroidal location into one of five magnetic islands. Heat flux detachment was achieved for the price of a loss of 15 % in the stored energy. Ne seeding allows for sustained enhancement of edge radiation with a very slow decay of line emission of several tens of seconds after the end of the injection indicating a high recycling of this noble gas at the carbon main plasma facing components. In N2 seeded discharges it is shown that a response of line emission and plasma parameters is in correlation to the puff duration which indicates a higher level of absorption of this seeding gas in the wall. Continuous N2 seeding results in global cooling of the scrape-off layer (SOL) and decay of radiation over several seconds after the injection. Damping of counter-streaming SOL flows, and divertor particle fluxes induced by Ne and N2 seeding have been measured and provide evidence for a reduction of the convective part of the divertor heat fluxes. Losses in density in response to seeding can be compensated by feedback controlled divertor fueling. The controlled reduction of heat fluxes within this complex 3D edge island geometry is a very promising finding concerning detachment control in a future all-metal divertor. L'échappement de puissance radiative par ensemencement d'impuretés a été démontré pour la première fois dans des configurations de divertor en îlot au stellarator Wendelstein 7-X. La faisabilité d'un fonctionnement plasma stable a été démontrée lors de l'ensemencement avec du néon (Ne) et de l'azote (N2). Il a été constaté que des pertes de puissance radiative élevées (80%) réduisaient globalement ... Article in Journal/Newspaper Edge Island Université de Nantes: HAL-UNIV-NANTES Nuclear Fusion 59 10 106020 |