Dynamics and dependencies of the configuration-dependent 1–2 kHz fluctuation in W7-X
A 1–2 kHz electromagnetic mode is present in a large fraction of W7-X discharges in the standard magnetic field configurations with 5/5 edge island structure. The power in the mode is significantly reduced in other magnetic configurations. The mode can appear spontaneously and persist for the full d...
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ftdoajarticles:oai:doaj.org/article:e8ba88fd95c847acb345353c250655b0 2023-05-15T16:04:03+02:00 Dynamics and dependencies of the configuration-dependent 1–2 kHz fluctuation in W7-X S.B. Ballinger J.L. Terry S.G. Baek M. Beurskens K.J. Brunner G. Fuchert J. Knauer C. Killer E. Pasch K. Rahbarnia J. Schilling E. Scott A. von Stechow H. Thomsen O. Grulke G. Wurden G. Kocsis T. Szepesi L. Zsuga 2021-06-01T00:00:00Z https://doi.org/10.1016/j.nme.2021.100967 https://doaj.org/article/e8ba88fd95c847acb345353c250655b0 EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S2352179121000533 https://doaj.org/toc/2352-1791 2352-1791 doi:10.1016/j.nme.2021.100967 https://doaj.org/article/e8ba88fd95c847acb345353c250655b0 Nuclear Materials and Energy, Vol 27, Iss , Pp 100967- (2021) Nuclear engineering. Atomic power TK9001-9401 article 2021 ftdoajarticles https://doi.org/10.1016/j.nme.2021.100967 2022-12-31T13:52:47Z A 1–2 kHz electromagnetic mode is present in a large fraction of W7-X discharges in the standard magnetic field configurations with 5/5 edge island structure. The power in the mode is significantly reduced in other magnetic configurations. The mode can appear spontaneously and persist for the full duration of a discharge. Its full width at half maximum is typically 100–300 Hz.The 1–2 kHz mode was first observed in visible light emissions from the divertor [1]. Matching spectral peaks were found in measurements of both global and edge plasma parameters, including line-integrated density, diamagnetic energy, and edge floating potential and ion saturation current [2]. An infrared camera recording shows a temperature modulation of ~ 2.5 K due to this mode on a divertor tile where the average temperature was 600 °C. Separate correlation analyses of the high-speed camera recordings, Langmuir probe signals, and Mirnov coil signals all indicate a poloidal velocity of 0.5–10 km/s and m = 2 as a likely poloidal mode number. Langmuir probes mounted on the Multi-Purpose Manipulator show that the fluctuation is present in one of the magnetic islands over a radial distance of at least 5 mm.A database of various diagnostic measurements and dB/dt signals from a Mirnov coil was created using a majority of the discharges from the 2018 campaign on W7-X, in order to shed light on the plasma parameters that are correlated with the existence of the 1–2 kHz mode. The power in the mode is positively correlated to the toroidal current, total external heating power, and core electron temperature. It is negatively correlated with plasma density. Article in Journal/Newspaper Edge Island Directory of Open Access Journals: DOAJ Articles Langmuir ENVELOPE(-67.150,-67.150,-66.967,-66.967) Nuclear Materials and Energy 27 100967 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Nuclear engineering. Atomic power TK9001-9401 |
spellingShingle |
Nuclear engineering. Atomic power TK9001-9401 S.B. Ballinger J.L. Terry S.G. Baek M. Beurskens K.J. Brunner G. Fuchert J. Knauer C. Killer E. Pasch K. Rahbarnia J. Schilling E. Scott A. von Stechow H. Thomsen O. Grulke G. Wurden G. Kocsis T. Szepesi L. Zsuga Dynamics and dependencies of the configuration-dependent 1–2 kHz fluctuation in W7-X |
topic_facet |
Nuclear engineering. Atomic power TK9001-9401 |
description |
A 1–2 kHz electromagnetic mode is present in a large fraction of W7-X discharges in the standard magnetic field configurations with 5/5 edge island structure. The power in the mode is significantly reduced in other magnetic configurations. The mode can appear spontaneously and persist for the full duration of a discharge. Its full width at half maximum is typically 100–300 Hz.The 1–2 kHz mode was first observed in visible light emissions from the divertor [1]. Matching spectral peaks were found in measurements of both global and edge plasma parameters, including line-integrated density, diamagnetic energy, and edge floating potential and ion saturation current [2]. An infrared camera recording shows a temperature modulation of ~ 2.5 K due to this mode on a divertor tile where the average temperature was 600 °C. Separate correlation analyses of the high-speed camera recordings, Langmuir probe signals, and Mirnov coil signals all indicate a poloidal velocity of 0.5–10 km/s and m = 2 as a likely poloidal mode number. Langmuir probes mounted on the Multi-Purpose Manipulator show that the fluctuation is present in one of the magnetic islands over a radial distance of at least 5 mm.A database of various diagnostic measurements and dB/dt signals from a Mirnov coil was created using a majority of the discharges from the 2018 campaign on W7-X, in order to shed light on the plasma parameters that are correlated with the existence of the 1–2 kHz mode. The power in the mode is positively correlated to the toroidal current, total external heating power, and core electron temperature. It is negatively correlated with plasma density. |
format |
Article in Journal/Newspaper |
author |
S.B. Ballinger J.L. Terry S.G. Baek M. Beurskens K.J. Brunner G. Fuchert J. Knauer C. Killer E. Pasch K. Rahbarnia J. Schilling E. Scott A. von Stechow H. Thomsen O. Grulke G. Wurden G. Kocsis T. Szepesi L. Zsuga |
author_facet |
S.B. Ballinger J.L. Terry S.G. Baek M. Beurskens K.J. Brunner G. Fuchert J. Knauer C. Killer E. Pasch K. Rahbarnia J. Schilling E. Scott A. von Stechow H. Thomsen O. Grulke G. Wurden G. Kocsis T. Szepesi L. Zsuga |
author_sort |
S.B. Ballinger |
title |
Dynamics and dependencies of the configuration-dependent 1–2 kHz fluctuation in W7-X |
title_short |
Dynamics and dependencies of the configuration-dependent 1–2 kHz fluctuation in W7-X |
title_full |
Dynamics and dependencies of the configuration-dependent 1–2 kHz fluctuation in W7-X |
title_fullStr |
Dynamics and dependencies of the configuration-dependent 1–2 kHz fluctuation in W7-X |
title_full_unstemmed |
Dynamics and dependencies of the configuration-dependent 1–2 kHz fluctuation in W7-X |
title_sort |
dynamics and dependencies of the configuration-dependent 1–2 khz fluctuation in w7-x |
publisher |
Elsevier |
publishDate |
2021 |
url |
https://doi.org/10.1016/j.nme.2021.100967 https://doaj.org/article/e8ba88fd95c847acb345353c250655b0 |
long_lat |
ENVELOPE(-67.150,-67.150,-66.967,-66.967) |
geographic |
Langmuir |
geographic_facet |
Langmuir |
genre |
Edge Island |
genre_facet |
Edge Island |
op_source |
Nuclear Materials and Energy, Vol 27, Iss , Pp 100967- (2021) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S2352179121000533 https://doaj.org/toc/2352-1791 2352-1791 doi:10.1016/j.nme.2021.100967 https://doaj.org/article/e8ba88fd95c847acb345353c250655b0 |
op_doi |
https://doi.org/10.1016/j.nme.2021.100967 |
container_title |
Nuclear Materials and Energy |
container_volume |
27 |
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100967 |
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