Journal Article

FZJ-2019-02811

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The effects of magnetic topology on the scrape-off layer turbulence transport in the first divertor plasma operation of Wendelstein 7-X using a new combined probe

Liu, S. C. ; Liang, Y. (Corresponding author)FZJ* ; Drews, P.FZJ* ; Killer, C. ; Knieps, A.FZJ* ; Xu, G. S. ; Wang, H. Q. ; Yan, N. ; Han, X.FZJ* ; Höschen, D.FZJ* ; Krämer-Flecken, A.FZJ* ; Nicolai, D.FZJ* ; Satheeswaran, G.FZJ* ; Hammond, K. ; Cai, J. Q.FZJ* ; Charl, A.FZJ* ; Cosfeld, J.FZJ* ; Fuchert, G. ; Gao, Y.FZJ* ; Geiger, J. ; Grulke, O. ; Henkel, M.FZJ* ; Hirsch, M. ; Hoefel, U. ; König, R.FZJ* ; Li, Y.FZJ* ; Neubauer, O.FZJ* ; Pasch, E. ; Rahbarnia, K. ; Rack, M.FZJ* ; Sandri, N.FZJ* ; Sereda, S.FZJ* ; Schweer, B.FZJ* ; Wang, E. H.FZJ* ; Xu, S.FZJ* ; Gao, X.

2019
IAEA Vienna

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Please use a persistent id in citations: doi:10.1088/1741-4326/ab0d29

Abstract: Wendelstein 7-X (W7-X) was operated successfully with the first divertor plasma in the operation phase 1.2a (OP1.2a). A new combined probe head, developed and installed on the multiple-purpose manipulator, is able to measure the edge plasma profiles (), variation of magnetic field, poloidal and radial turbulence structures. The scrape-off layer (SOL) plasma parameters in two magnetic configurations (standard and high mirror) are in good agreement with the magnetic island structure and the field line connection length calculated by the field line tracer. In both the standard and high mirror configurations, the radial turbulent heat flux and particle flux have strong dependence on the local magnetic topology, revealing two distinct transport patterns: a broadband turbulence dominant region in the outer SOL and a low frequency dominant region in the inner SOL. In the standard divertor configuration, the broadband turbulence with a frequency range of 40–120 kHz is located near the island center along the probe path, leading to outward transport. These broadband fluctuations propagate with a velocity of 2.3–4.4 km s−1 poloidally along the ion diamagnetic drift direction in the plasma frame, with close to 0.1. The large radial transport induced by the broadband turbulence is accompanied by a steep electron density gradient. The low frequency (5–30 kHz) dominant transport exhibits obvious intermittent structure. Some statistical techniques are applied to the characterization of the intermittent transport.

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Contributing Institute(s):

1. Plasmaphysik (IEK-4)
2. Bioelektronik (ICS-8)

Research Program(s):

1. 174 - Plasma-Wall-Interaction (POF3-174) (POF3-174)

Appears in the scientific report 2019

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Database coverage:
Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; National-Konsortium ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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