Characterization of the W7-X scrape-off layer using reciprocating probes

Paper

Carsten Killer*, Olaf Grulke, Philipp Drews, Yu Gao, Marcin Jakubowski, Alexander Knieps, Dirk Nicolai, Holger Niemann, Aleix Puig Sitjes, Guruparan Satheeswaran, W7-X Team

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The W7-X scrape-off layer (SOL) with its characteristic magnetic island chain has been investigated using electric probes mounted on a reciprocating manipulator close to the outboard mid-plane. A survey of the W7-X configuration space shows that the presence and particular topology of magnetic islands significantly affects the SOL profiles of electron temperature, density, electric field and plasma flows. Particularly relevant for divertor operation, very wide SOL heat flux profiles have been observed in some magnetic configurations, which we link to the presence of magnetic islands. In these situations, the islands can feature a local minimum of the plasma potential accompanied by a direction reversal of E x B driven dynamics measured by probe arrays.
Original languageEnglish
Article number086013
JournalNuclear Fusion
Volume59
Issue number8
Number of pages13
ISSN0029-5515
DOIs
Publication statusPublished - 2019

Keywords

  • Scrape-off layer
  • Stallarator
  • Langmuir probes

Cite this

Killer, C., Grulke, O., Drews, P., Gao, Y., Jakubowski, M., Knieps, A., ... W7-X Team (2019). Characterization of the W7-X scrape-off layer using reciprocating probes: Paper. Nuclear Fusion, 59(8), [086013]. https://doi.org/10.1088/1741-4326/ab2272
Killer, Carsten ; Grulke, Olaf ; Drews, Philipp ; Gao, Yu ; Jakubowski, Marcin ; Knieps, Alexander ; Nicolai, Dirk ; Niemann, Holger ; Sitjes, Aleix Puig ; Satheeswaran, Guruparan ; W7-X Team. / Characterization of the W7-X scrape-off layer using reciprocating probes : Paper. In: Nuclear Fusion. 2019 ; Vol. 59, No. 8.
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title = "Characterization of the W7-X scrape-off layer using reciprocating probes: Paper",
abstract = "The W7-X scrape-off layer (SOL) with its characteristic magnetic island chain has been investigated using electric probes mounted on a reciprocating manipulator close to the outboard mid-plane. A survey of the W7-X configuration space shows that the presence and particular topology of magnetic islands significantly affects the SOL profiles of electron temperature, density, electric field and plasma flows. Particularly relevant for divertor operation, very wide SOL heat flux profiles have been observed in some magnetic configurations, which we link to the presence of magnetic islands. In these situations, the islands can feature a local minimum of the plasma potential accompanied by a direction reversal of E x B driven dynamics measured by probe arrays.",
keywords = "Scrape-off layer, Stallarator, Langmuir probes",
author = "Carsten Killer and Olaf Grulke and Philipp Drews and Yu Gao and Marcin Jakubowski and Alexander Knieps and Dirk Nicolai and Holger Niemann and Sitjes, {Aleix Puig} and Guruparan Satheeswaran and {W7-X Team}",
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language = "English",
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Killer, C, Grulke, O, Drews, P, Gao, Y, Jakubowski, M, Knieps, A, Nicolai, D, Niemann, H, Sitjes, AP, Satheeswaran, G & W7-X Team 2019, 'Characterization of the W7-X scrape-off layer using reciprocating probes: Paper', Nuclear Fusion, vol. 59, no. 8, 086013. https://doi.org/10.1088/1741-4326/ab2272

Characterization of the W7-X scrape-off layer using reciprocating probes : Paper. / Killer, Carsten; Grulke, Olaf; Drews, Philipp; Gao, Yu; Jakubowski, Marcin; Knieps, Alexander; Nicolai, Dirk; Niemann, Holger; Sitjes, Aleix Puig; Satheeswaran, Guruparan; W7-X Team.

In: Nuclear Fusion, Vol. 59, No. 8, 086013, 2019.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Characterization of the W7-X scrape-off layer using reciprocating probes

T2 - Paper

AU - Killer, Carsten

AU - Grulke, Olaf

AU - Drews, Philipp

AU - Gao, Yu

AU - Jakubowski, Marcin

AU - Knieps, Alexander

AU - Nicolai, Dirk

AU - Niemann, Holger

AU - Sitjes, Aleix Puig

AU - Satheeswaran, Guruparan

AU - W7-X Team

PY - 2019

Y1 - 2019

N2 - The W7-X scrape-off layer (SOL) with its characteristic magnetic island chain has been investigated using electric probes mounted on a reciprocating manipulator close to the outboard mid-plane. A survey of the W7-X configuration space shows that the presence and particular topology of magnetic islands significantly affects the SOL profiles of electron temperature, density, electric field and plasma flows. Particularly relevant for divertor operation, very wide SOL heat flux profiles have been observed in some magnetic configurations, which we link to the presence of magnetic islands. In these situations, the islands can feature a local minimum of the plasma potential accompanied by a direction reversal of E x B driven dynamics measured by probe arrays.

AB - The W7-X scrape-off layer (SOL) with its characteristic magnetic island chain has been investigated using electric probes mounted on a reciprocating manipulator close to the outboard mid-plane. A survey of the W7-X configuration space shows that the presence and particular topology of magnetic islands significantly affects the SOL profiles of electron temperature, density, electric field and plasma flows. Particularly relevant for divertor operation, very wide SOL heat flux profiles have been observed in some magnetic configurations, which we link to the presence of magnetic islands. In these situations, the islands can feature a local minimum of the plasma potential accompanied by a direction reversal of E x B driven dynamics measured by probe arrays.

KW - Scrape-off layer

KW - Stallarator

KW - Langmuir probes

U2 - 10.1088/1741-4326/ab2272

DO - 10.1088/1741-4326/ab2272

M3 - Journal article

VL - 59

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

IS - 8

M1 - 086013

ER -

Killer C, Grulke O, Drews P, Gao Y, Jakubowski M, Knieps A et al. Characterization of the W7-X scrape-off layer using reciprocating probes: Paper. Nuclear Fusion. 2019;59(8). 086013. https://doi.org/10.1088/1741-4326/ab2272