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

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 islan...

Full description

Saved in:
Bibliographic Details
Published inNuclear fusion Vol. 59; no. 8; pp. 86013 - 86025
Main Authors Killer, Carsten, Grulke, Olaf, Drews, Philipp, Gao, Yu, Jakubowski, Marcin, Knieps, Alexander, Nicolai, Dirk, Niemann, Holger, Sitjes, Aleix Puig, Satheeswaran, Guruparan
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.08.2019
Subjects
Langmuir probes
scrape-off layer
stellarator
Online AccessGet full text

Cover

More Information
Summary: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 driven dynamics measured by probe arrays.
Bibliography:International Atomic Energy Agency
NF-102941.R2
ISSN:0029-5515
1741-4326
DOI:10.1088/1741-4326/ab2272