Journal Article

FZJ-2018-06966

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Characteristics of the SOL turbulence structure in the first experimental campaign on W7-X with limiter configuration

Liu, S. C. (Corresponding author) ; Liang, Y.FZJ* ; Drews, P.FZJ* ; Krämer-Flecken, A.FZJ* ; Han, X.FZJ* ; Nicolai, D.FZJ* ; Satheeswaran, G.FZJ* ; Wang, N. C. ; Cai, J.FZJ* ; Charl, A.FZJ* ; Cosfeld, J.FZJ* ; Gao, Y.FZJ* ; Grulke, O. ; Henkel, M.FZJ* ; Hollfeld, K. P.FZJ* ; Killer, C. ; Knieps, A.FZJ* ; König, R.FZJ* ; Neubauer, O.FZJ* ; Rack, M.FZJ* ; Sandri, N.FZJ* ; Sereda, S.FZJ* ; Schweer, B.FZJ* ; Wang, E.FZJ* ; Wei, Y.FZJ*

2018
American Institute of Physics [S.l.]

This record in other databases:    

Please use a persistent id in citations: http://hdl.handle.net/2128/20271  doi:10.1063/1.5033353

Abstract: In the first experimental campaign of Wendelstein 7-X (W7-X), a combined probe head mounted on the multi-purpose manipulator has been used to measure the scrape-off layer (SOL) turbulence characteristics. The preliminary experimental results are summarized to illustrate the SOL turbulence properties in the limiter configuration on W7-X. In a standard limiter configuration, significant electrostatic fluctuations can be found in the near SOL, and the dominant frequency of fluctuation power is below 100 kHz. The auto-correlation spectrum power law decay factor is α ≈ −1 below 40 kHz and α ≈ –2 between 50 and 200 kHz. A broadband spectrum appears between 240 and 380 kHz with a low spectral power density, but a high cross-correlation coefficient. The statistical characteristics of turbulence are calculated by the two-point cross-correlation technique. A clear poloidal dispersion relation is found in the spectrum S(kθ, f), propagating along the ion diamagnetic drift direction with a group velocity (below 100 kHz) about 0.56 km/s in the near SOL in the laboratory frame. The poloidal correlation length is around 5–10 mm in SOL. The turbulence phase velocity is about 0.5–1 km/s when close to the last closed flux surface, which is comparable with the poloidal E × B drift speed.

---

Contributing Institute(s):

1. Plasmaphysik (IEK-4)

Research Program(s):

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

Appears in the scientific report 2018

---

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

---