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Turbulent transport in the scrape-off layer of Wendelstein 7-X

W7-X Team; Killer, Carsten; Narbutt, Yann; Grulke, Olaf; Gantenbein, Gerd; Huber, Martina; Illy, Stefan; Jelonnek, John; Kobarg, Thorsten; Lang, Rouven; Leonhardt, Wolfgang; Mellein, Daniel; Papenfuß, Daniel; Scherer, Theo; Thumm, Manfred; Wadle, Simone; Weggen, Jörg


Turbulent transport is widely considered to be the main driver for cross-field transport in the scrape-off layer (SOL) of toroidal magnetized plasmas. Here, reciprocating Langmuir probes are employed to measure both the plasma profiles and the turbulent particle transport in the SOL of the Wendelstein 7-X stellarator. The relation between turbulent radial particle flux Γr and the local pressure gradient is often approximately linear across the entire SOL width, indicating that radial turbulence spreading is absent. This observation holds across a wide range of magnetic configurations and different plasma heating and density scenarios. The magnitude of the turbulent transport for a given gradient reveals a dependence on the magnetic configuration and the position in the SOL, which we relate to the cross-spectral characteristics of multi-tip floating potential measurements. Magnetic islands can add further complexity due to non-monotonic SOL profiles and the breaking of the transport-gradient relation. Finally, anomalous diffusion coefficients are determined from the probe measurements.

Verlagsausgabe §
DOI: 10.5445/IR/1000137154
Veröffentlicht am 03.09.2021
DOI: 10.1088/1741-4326/ac1ae3
Zitationen: 6
Web of Science
Zitationen: 5
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2021
Sprache Englisch
Identifikator ISSN: 0029-5515, 1741-4326
KITopen-ID: 1000137154
HGF-Programm 31.13.02 (POF IV, LK 01) Plasma Heating & Current Drive Systems
Erschienen in Nuclear fusion
Verlag International Atomic Energy Agency (IAEA)
Band 61
Heft 9
Seiten Art.-Nr.: 096038
Projektinformation EUROfusion_H2020 (EU, H2020, 633053)
Vorab online veröffentlicht am 24.08.2021
Nachgewiesen in Scopus
Web of Science
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