Effect of toroidal plasma currents on the Wendelstein 7-X Scrape-Off Layer

Carsten Killer; Yu Gao; Valeria Perseo; Lukas Rudischhauser; Kenneth Hammond; Birger Buttenschön; Tullio Barbui; Boyd D. Blackwell; Kai Jakob Brunner; Philipp Drews; Michael Endler; Joachim Geiger; Olaf Grulke; Marcin Jakubowski; Sören Klose; Jens Knauer; Alexander Knieps; Ralf König; Yongliang Li; Ulrich Neuner; Holger Niemann; Matthias Otte; Jonathan Schilling; Aleix Puig Sitjes; Kian Rahbarnia; Torsten Stange

doi:10.1088/1361-6587/ab4f2d

Effect of toroidal plasma currents on the Wendelstein 7-X Scrape-Off Layer

Carsten Killer, Yu Gao, Valeria Perseo, Lukas Rudischhauser, Kenneth Hammond, Birger Buttenschön, Tullio Barbui, Boyd D. Blackwell, Kai Jakob Brunner, Philipp Drews, Michael Endler, Joachim Geiger, Olaf Grulke, Marcin Jakubowski, Sören Klose, Jens Knauer, Alexander Knieps, Ralf König, Yongliang Li, Ulrich NeunerHolger Niemann, Matthias Otte, Jonathan Schilling, Aleix Puig Sitjes, Kian Rahbarnia, Torsten Stange

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15 Citations (Scopus)

Abstract

The role of toroidal plasma currents for the island divertor scrape-off layer in the stellarator Wendelstein 7-X is investigated using reciprocating electric probes. Experiments show that small amounts (of a few kA) of plasma current are sufficient to significantly affect the scrape-off layer plasma conditions, whereas higher plasma currents above 10kA result in more drastic changes. This behavior is linked to the effect of the plasma current on the rotational transform profile, which can result in significant shifts of the edge magnetic islands. These shifts affect the interaction of the islands with the divertor and can eventually result in a transition from a diverted to a limited plasma configuration. The probe observations are complemented by further edge diagnostics including plasma flow measurements, divertor Langmuir probes, divertor thermography and impurity spectroscopy.

Original language	English
Article number	125014
Journal	Plasma Physics and Controlled Fusion
Volume	61
Issue number	12
DOIs	https://doi.org/10.1088/1361-6587/ab4f2d
Publication status	Published - 8 Nov 2019

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Killer, C., Gao, Y., Perseo, V., Rudischhauser, L., Hammond, K., Buttenschön, B., Barbui, T., Blackwell, B. D., Brunner, K. J., Drews, P., Endler, M., Geiger, J., Grulke, O., Jakubowski, M., Klose, S., Knauer, J., Knieps, A., König, R., Li, Y., ... Stange, T. (2019). Effect of toroidal plasma currents on the Wendelstein 7-X Scrape-Off Layer. Plasma Physics and Controlled Fusion, 61(12), Article 125014. https://doi.org/10.1088/1361-6587/ab4f2d

@article{c051792f1c8849b68ece461deebb9fae,

title = "Effect of toroidal plasma currents on the Wendelstein 7-X Scrape-Off Layer",

abstract = "The role of toroidal plasma currents for the island divertor scrape-off layer in the stellarator Wendelstein 7-X is investigated using reciprocating electric probes. Experiments show that small amounts (of a few kA) of plasma current are sufficient to significantly affect the scrape-off layer plasma conditions, whereas higher plasma currents above 10kA result in more drastic changes. This behavior is linked to the effect of the plasma current on the rotational transform profile, which can result in significant shifts of the edge magnetic islands. These shifts affect the interaction of the islands with the divertor and can eventually result in a transition from a diverted to a limited plasma configuration. The probe observations are complemented by further edge diagnostics including plasma flow measurements, divertor Langmuir probes, divertor thermography and impurity spectroscopy.",

keywords = "Scrape-Off Layer, island divertor, reciprocating probe, stellarator",

author = "Carsten Killer and Yu Gao and Valeria Perseo and Lukas Rudischhauser and Kenneth Hammond and Birger Buttensch{\"o}n and Tullio Barbui and Blackwell, {Boyd D.} and Brunner, {Kai Jakob} and Philipp Drews and Michael Endler and Joachim Geiger and Olaf Grulke and Marcin Jakubowski and S{\"o}ren Klose and Jens Knauer and Alexander Knieps and Ralf K{\"o}nig and Yongliang Li and Ulrich Neuner and Holger Niemann and Matthias Otte and Jonathan Schilling and Sitjes, {Aleix Puig} and Kian Rahbarnia and Torsten Stange",

note = "Publisher Copyright: {\textcopyright} 2019 IOP Publishing Ltd.",

year = "2019",

month = nov,

day = "8",

doi = "10.1088/1361-6587/ab4f2d",

language = "English",

volume = "61",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

publisher = "IOP Publishing Ltd.",

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Killer, C, Gao, Y, Perseo, V, Rudischhauser, L, Hammond, K, Buttenschön, B, Barbui, T, Blackwell, BD, Brunner, KJ, Drews, P, Endler, M, Geiger, J, Grulke, O, Jakubowski, M, Klose, S, Knauer, J, Knieps, A, König, R, Li, Y, Neuner, U, Niemann, H, Otte, M, Schilling, J, Sitjes, AP, Rahbarnia, K & Stange, T 2019, 'Effect of toroidal plasma currents on the Wendelstein 7-X Scrape-Off Layer', Plasma Physics and Controlled Fusion, vol. 61, no. 12, 125014. https://doi.org/10.1088/1361-6587/ab4f2d

TY - JOUR

T1 - Effect of toroidal plasma currents on the Wendelstein 7-X Scrape-Off Layer

AU - Killer, Carsten

AU - Gao, Yu

AU - Perseo, Valeria

AU - Rudischhauser, Lukas

AU - Hammond, Kenneth

AU - Buttenschön, Birger

AU - Barbui, Tullio

AU - Blackwell, Boyd D.

AU - Brunner, Kai Jakob

AU - Drews, Philipp

AU - Endler, Michael

AU - Geiger, Joachim

AU - Grulke, Olaf

AU - Jakubowski, Marcin

AU - Klose, Sören

AU - Knauer, Jens

AU - Knieps, Alexander

AU - König, Ralf

AU - Li, Yongliang

AU - Neuner, Ulrich

AU - Niemann, Holger

AU - Otte, Matthias

AU - Schilling, Jonathan

AU - Sitjes, Aleix Puig

AU - Rahbarnia, Kian

AU - Stange, Torsten

PY - 2019/11/8

Y1 - 2019/11/8

N2 - The role of toroidal plasma currents for the island divertor scrape-off layer in the stellarator Wendelstein 7-X is investigated using reciprocating electric probes. Experiments show that small amounts (of a few kA) of plasma current are sufficient to significantly affect the scrape-off layer plasma conditions, whereas higher plasma currents above 10kA result in more drastic changes. This behavior is linked to the effect of the plasma current on the rotational transform profile, which can result in significant shifts of the edge magnetic islands. These shifts affect the interaction of the islands with the divertor and can eventually result in a transition from a diverted to a limited plasma configuration. The probe observations are complemented by further edge diagnostics including plasma flow measurements, divertor Langmuir probes, divertor thermography and impurity spectroscopy.

AB - The role of toroidal plasma currents for the island divertor scrape-off layer in the stellarator Wendelstein 7-X is investigated using reciprocating electric probes. Experiments show that small amounts (of a few kA) of plasma current are sufficient to significantly affect the scrape-off layer plasma conditions, whereas higher plasma currents above 10kA result in more drastic changes. This behavior is linked to the effect of the plasma current on the rotational transform profile, which can result in significant shifts of the edge magnetic islands. These shifts affect the interaction of the islands with the divertor and can eventually result in a transition from a diverted to a limited plasma configuration. The probe observations are complemented by further edge diagnostics including plasma flow measurements, divertor Langmuir probes, divertor thermography and impurity spectroscopy.

KW - Scrape-Off Layer

KW - island divertor

KW - reciprocating probe

KW - stellarator

UR - http://www.scopus.com/inward/record.url?scp=85075982068&partnerID=8YFLogxK

U2 - 10.1088/1361-6587/ab4f2d

DO - 10.1088/1361-6587/ab4f2d

M3 - Article

SN - 0741-3335

VL - 61

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 12

M1 - 125014

ER -

Effect of toroidal plasma currents on the Wendelstein 7-X Scrape-Off Layer

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