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

W7-X Team; 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

W7-X Team, 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 LiUlrich Neuner, Holger Niemann, Matthias Otte, Jonathan Schilling, Aleix Puig Sitjes, Kian Rahbarnia, Torsten Stange

^*Corresponding author for this work

Department of Physics

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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
Number of pages	9
ISSN	0741-3335
DOIs	https://doi.org/10.1088/1361-6587/ab4f2d
Publication status	Published - 2019

Keywords

Stellarator
Scrape-off layer
Reciprocating probe
Island divertor

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W7-X Team, 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., ... 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{c2a793d2901f4ae087700b3d88b2eb4b,

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 = "Stellarator, Scrape-off layer, Reciprocating probe, Island divertor",

author = "{W7-X Team} and 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 Kai-Jakob Brunner 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",

year = "2019",

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

language = "English",

volume = "61",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

publisher = "IOP Publishing",

number = "12",

}

W7-X Team, Killer, C, Gao, Y, Perseo, V, Rudischhauser, L, Hammond, K, Buttenschön, B, Barbui, T, Blackwell, BD, Brunner, K-J, 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 - W7-X Team

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

Y1 - 2019

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 - Stellarator

KW - Scrape-off layer

KW - Reciprocating probe

KW - Island divertor

U2 - 10.1088/1361-6587/ab4f2d

DO - 10.1088/1361-6587/ab4f2d

M3 - Journal 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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