Effect of toroidal plasma currents on theWendelstein 7-X Scrape-Off Layer
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Authors
Killer, C.
Gao, Yu
Perseo, Valeria
Rudischhauser, L.
Hammond, K
Buttenschön, Birger
Barbui, Tullio
Blackwell, Boyd
Brunner, Kai-Jakob
Drews, Philipp
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Institute of Physics Publishing
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.
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Plasma Physics and Controlled Fusion
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Open Access
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Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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