Multi-diagnostic analysis of plasma filaments in the island divertor
Filaments or blobs are well known structures in turbulence in magnetic fusion devices, they are considered to be the major cross-transport channel in the scrape off layer. They originate at the last closed magnetic flux surface and propagate out on the low field side of toroidal devices due to polar...
Published in: | Plasma Physics and Controlled Fusion |
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ftfzjuelichnvdb:oai:juser.fz-juelich.de:873531 2024-09-15T18:04:25+00:00 Multi-diagnostic analysis of plasma filaments in the island divertor Zoletnik, S. Anda, G. Shanahan, B. Szepesi, T. Vecsei, M. Zsuga, L. Biedermann, C. Carralero, A. D. Cseh, G. Dunai, D. Killer, C. Kocsis, G. Krämer-Flecken, A. Otte, M. DE 2020 https://juser.fz-juelich.de/record/873531 https://juser.fz-juelich.de/search?p=id:%22FZJ-2020-00799%22 eng eng IOP Publ. info:eu-repo/semantics/altIdentifier/issn/2057-7648 info:eu-repo/semantics/altIdentifier/issn/0368-3281 info:eu-repo/semantics/altIdentifier/issn/0032-1028 info:eu-repo/semantics/altIdentifier/doi/10.1088/1361-6587/ab5241 info:eu-repo/semantics/altIdentifier/wos/WOS:000499376700001 info:eu-repo/semantics/altIdentifier/issn/1879-2979 info:eu-repo/semantics/altIdentifier/issn/1361-6587 info:eu-repo/semantics/altIdentifier/issn/0741-3335 https://juser.fz-juelich.de/record/873531 https://juser.fz-juelich.de/search?p=id:%22FZJ-2020-00799%22 info:eu-repo/semantics/closedAccess Plasma physics and controlled fusion 62(1), 014017 - (2020). doi:10.1088/1361-6587/ab5241 info:eu-repo/classification/ddc/620 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2020 ftfzjuelichnvdb https://doi.org/10.1088/1361-6587/ab5241 2024-08-05T23:55:46Z Filaments or blobs are well known structures in turbulence in magnetic fusion devices, they are considered to be the major cross-transport channel in the scrape off layer. They originate at the last closed magnetic flux surface and propagate out on the low field side of toroidal devices due to polarization in the curved magnetic field. The Wendelstein 7-X stellarator has a complex three-dimensional magnetic field structure and additionally the plasma is bounded by a chain of magnetic islands, forming an island divertor. After the first observation of filaments in Wendelstein 7-X with video cameras a multi-diagnostic study is presented in this paper to reveal their 3D structure and dynamics. Filaments are seen to be born at the edge and, at least in some cases, seen to extend to up to 4 toroidal turns. After moving radially out a few cm they enter the edge island. Here they disappear from the equatorial plane and about 200 microseconds later reappear on the outboard side of the island. A long-wavelength (~20–30 cm) quasi coherent mode is observed in both regions where filaments appear. The similarities and differences between the filaments seen in W7-X and other devices are discussed. Possible explanations for this strange radial propagation are considered, together with the likely role of filaments in the edge and island density profile. Article in Journal/Newspaper Edge Island Forschungszentrum Jülich: JuSER (Juelich Shared Electronic Resources) Plasma Physics and Controlled Fusion 62 1 014017 |
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Forschungszentrum Jülich: JuSER (Juelich Shared Electronic Resources) |
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ftfzjuelichnvdb |
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English |
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info:eu-repo/classification/ddc/620 |
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info:eu-repo/classification/ddc/620 Zoletnik, S. Anda, G. Shanahan, B. Szepesi, T. Vecsei, M. Zsuga, L. Biedermann, C. Carralero, A. D. Cseh, G. Dunai, D. Killer, C. Kocsis, G. Krämer-Flecken, A. Otte, M. Multi-diagnostic analysis of plasma filaments in the island divertor |
topic_facet |
info:eu-repo/classification/ddc/620 |
description |
Filaments or blobs are well known structures in turbulence in magnetic fusion devices, they are considered to be the major cross-transport channel in the scrape off layer. They originate at the last closed magnetic flux surface and propagate out on the low field side of toroidal devices due to polarization in the curved magnetic field. The Wendelstein 7-X stellarator has a complex three-dimensional magnetic field structure and additionally the plasma is bounded by a chain of magnetic islands, forming an island divertor. After the first observation of filaments in Wendelstein 7-X with video cameras a multi-diagnostic study is presented in this paper to reveal their 3D structure and dynamics. Filaments are seen to be born at the edge and, at least in some cases, seen to extend to up to 4 toroidal turns. After moving radially out a few cm they enter the edge island. Here they disappear from the equatorial plane and about 200 microseconds later reappear on the outboard side of the island. A long-wavelength (~20–30 cm) quasi coherent mode is observed in both regions where filaments appear. The similarities and differences between the filaments seen in W7-X and other devices are discussed. Possible explanations for this strange radial propagation are considered, together with the likely role of filaments in the edge and island density profile. |
format |
Article in Journal/Newspaper |
author |
Zoletnik, S. Anda, G. Shanahan, B. Szepesi, T. Vecsei, M. Zsuga, L. Biedermann, C. Carralero, A. D. Cseh, G. Dunai, D. Killer, C. Kocsis, G. Krämer-Flecken, A. Otte, M. |
author_facet |
Zoletnik, S. Anda, G. Shanahan, B. Szepesi, T. Vecsei, M. Zsuga, L. Biedermann, C. Carralero, A. D. Cseh, G. Dunai, D. Killer, C. Kocsis, G. Krämer-Flecken, A. Otte, M. |
author_sort |
Zoletnik, S. |
title |
Multi-diagnostic analysis of plasma filaments in the island divertor |
title_short |
Multi-diagnostic analysis of plasma filaments in the island divertor |
title_full |
Multi-diagnostic analysis of plasma filaments in the island divertor |
title_fullStr |
Multi-diagnostic analysis of plasma filaments in the island divertor |
title_full_unstemmed |
Multi-diagnostic analysis of plasma filaments in the island divertor |
title_sort |
multi-diagnostic analysis of plasma filaments in the island divertor |
publisher |
IOP Publ. |
publishDate |
2020 |
url |
https://juser.fz-juelich.de/record/873531 https://juser.fz-juelich.de/search?p=id:%22FZJ-2020-00799%22 |
op_coverage |
DE |
genre |
Edge Island |
genre_facet |
Edge Island |
op_source |
Plasma physics and controlled fusion 62(1), 014017 - (2020). doi:10.1088/1361-6587/ab5241 |
op_relation |
info:eu-repo/semantics/altIdentifier/issn/2057-7648 info:eu-repo/semantics/altIdentifier/issn/0368-3281 info:eu-repo/semantics/altIdentifier/issn/0032-1028 info:eu-repo/semantics/altIdentifier/doi/10.1088/1361-6587/ab5241 info:eu-repo/semantics/altIdentifier/wos/WOS:000499376700001 info:eu-repo/semantics/altIdentifier/issn/1879-2979 info:eu-repo/semantics/altIdentifier/issn/1361-6587 info:eu-repo/semantics/altIdentifier/issn/0741-3335 https://juser.fz-juelich.de/record/873531 https://juser.fz-juelich.de/search?p=id:%22FZJ-2020-00799%22 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1088/1361-6587/ab5241 |
container_title |
Plasma Physics and Controlled Fusion |
container_volume |
62 |
container_issue |
1 |
container_start_page |
014017 |
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1810441903349432320 |