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

W7-X Team; Killer, Carsten; Gao, Yu; Perseo, Valeria; Rudischhauser, Lukas; Hammond, Kenneth; Buttenschön, Birger; Barbui, Tullio; Blackwell, Boyd D; Brunner, Kai-Jakob; Drews, Philipp; Endler, Michael; Geiger, Joachim; Grulke, Olaf; Jakubowski, Marcin; Klose, Sören; Knauer, Jens; Knieps, Alexander; König, Ralf; Li, Yongliang; Neuner, Ulrich; ... mehr

Abstract (englisch):
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.

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Originalveröffentlichung
DOI: 10.1088/1361-6587/ab4f2d
Scopus
Zitationen: 2
Web of Science
Zitationen: 2
Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2019
Sprache Englisch
Identifikator ISSN: 0741-3335, 1361-6587
KITopen-ID: 1000104271
HGF-Programm 31.03.02 (POF III, LK 01) Plasma Heizsysteme
Erschienen in Plasma physics and controlled fusion
Verlag IOP Publishing
Band 61
Heft 12
Seiten 125014
Projektinformation EUROfusion (EU, H2020, 633053)
Vorab online veröffentlicht am 08.11.2019
Nachgewiesen in Scopus
Web of Science
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