Home > Publications database > Characteristics of the SOL turbulence structure in the first experimental campaign on W7-X with limiter configuration > print

001     858022
005     20240708133203.0
024 7 _ |a 10.1063/1.5033353
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024 7 _ |a 1070-664X
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024 7 _ |a 1089-7674
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024 7 _ |a 1527-2419
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024 7 _ |a 2128/20271
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037 _ _ |a FZJ-2018-06966
082 _ _ |a 530
100 1 _ |a Liu, S. C.
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245 _ _ |a Characteristics of the SOL turbulence structure in the first experimental campaign on W7-X with limiter configuration
260 _ _ |a [S.l.]
|c 2018
|b American Institute of Physics
336 7 _ |a article
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336 7 _ |a ARTICLE
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520 _ _ |a 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.
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700 1 _ |a Krämer-Flecken, A.
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700 1 _ |a Han, X.
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700 1 _ |a Wang, N. C.
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700 1 _ |a Cai, Jianqing
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700 1 _ |a Charl, A.
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700 1 _ |a Gao, Yu
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700 1 _ |a Grulke, O.
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700 1 _ |a Henkel, M.
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700 1 _ |a Hollfeld, K. P.
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700 1 _ |a Killer, C.
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700 1 _ |a Knieps, A.
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700 1 _ |a König, R.
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700 1 _ |a Neubauer, O.
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700 1 _ |a Rack, M.
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700 1 _ |a Sandri, N.
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700 1 _ |a Sereda, S.
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700 1 _ |a Schweer, B.
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700 1 _ |a Wang, Erhui
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700 1 _ |a Wei, Yanling
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773 _ _ |a 10.1063/1.5033353
|g Vol. 25, no. 7, p. 072502 -
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|t Physics of plasmas
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856 4 _ |y Published on 2018-07-03. Available in OpenAccess from 2019-07-03.
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856 4 _ |y Published on 2018-07-03. Available in OpenAccess from 2019-07-03.
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