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Plasma filaments in the scrape-off layer of Wendelstein 7-X

W7-X Team; Killer, Carsten; Shanahan, Brendan; Grulke, Olaf; Endler, Michael; Hammond, Kenneth; Rudischhauser, Lukas; Gantenbein, Gerd; Huber, Martina; Illy, Stefan; Jelonnek, John; Kobarg, Thorsten; Lang, Rouven; Leonhardt, Wolfgang; Losert, M.; Mellein, Daniel; Papenfuß, Daniel; Scherer, Theo; Thumm, Manfred; Wadle, Simone; Weggen, Jörg

Abstract:
Plasma filaments have been observed by reciprocating electric probes in the Scrape-Off Layer (SOL) of the Wendelstein 7-X stellarator. Comparison with target probes indicates that a filament observed in the W7-X SOL extends to the sheath. Two-dimensional simulations of seeded filaments exhibit good quantitative agreement with experimental measurements in filament velocity scalings, despite an assumption of constant field line curvature. Both experiment and simulation show a slow radial propagation of filaments, indicating that filaments are essentially bound to their flux surface and do not perform ballistic radial motion. In contrast, the poloidal propagation along flux surfaces is much faster than the radial motion.

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Originalveröffentlichung
DOI: 10.1088/1361-6587/ab9313
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 08.2020
Sprache Englisch
Identifikator ISSN: 0741-3335, 1361-6587
KITopen-ID: 1000121099
HGF-Programm 31.03.02 (POF III, LK 01)
Plasma Heizsysteme
Erschienen in Plasma physics and controlled fusion
Band 62
Heft 8
Seiten 085003
Projektinformation EUROfusion (EU, H2020, 633053)
Vorab online veröffentlicht am 22.06.2020
Nachgewiesen in Scopus
Web of Science
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