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Statistical characteristics of the SOL turbulence in the first divertor plasma operation of W7-X using a reciprocating probe

W7-X Team; Liu, S. C.; Liang, Y.; Wang, H. Q.; Killer, C.; Drews, P.; Knieps, A.; Han, X.; Grulke, O.; Krämer-Flecken, A.; Xu, G. S.; Yan, N.; Höschen, D.; Nicolai, D.; Satheeswaran, G.; Geiger, J.; Henkel, M.; Huang, Z.; König, R.; Li, Y.; Neubauer, O.; ... mehr

Abstract (englisch):
The statistical characteristics of the scrape-off layer (SOL) turbulence have been investigated in the first divertor plasma operation of W7-X using a reciprocating probe. The turbulence spectra, auto-correlation time and the statistical parameters are analyzed in three magnetic configurations. In standard and high mirror configurations, the SOL turbulence can be classified into four patterns from the outer SOL to the inner SOL, and each pattern is characterized by the poloidal cross correlation spectrum and the turbulence propagation property. A strong dependence of the SOL turbulence on the magnetic topology is demonstrated experimentally. In high iota configuration, the SOL island is relatively narrow and consequently the fluctuation level of turbulence is weak in the far SOL but enhanced significantly in the near SOL. In the reversed field case, the SOL turbulence reveals similar propagation properties and statistical parameters with those in the normal field case, demonstrating the same turbulence structure in both toroidal field directions.

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Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2020
Sprache Englisch
Identifikator ISSN: 1070-664X, 1089-7674
KITopen-ID: 1000127865
HGF-Programm 31.03.02 (POF III, LK 01) Plasma Heizsysteme
Erschienen in Physics of plasmas
Verlag American Institute of Physics (AIP)
Band 27
Heft 12
Seiten Article: 122504
Projektinformation EUROfusion (EU, H2020, 633053)
Nachgewiesen in Web of Science
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