This title appears in the Scientific Report :
2018
Please use the identifier:
http://hdl.handle.net/2128/20271 in citations.
Please use the identifier: http://dx.doi.org/10.1063/1.5033353 in citations.
Characteristics of the SOL turbulence structure in the first experimental campaign on W7-X with limiter configuration
Characteristics of the SOL turbulence structure in the first experimental campaign on W7-X with limiter configuration
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...
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Personal Name(s): | Liu, S. C. (Corresponding author) |
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Liang, Yunfeng / Drews, P. / Krämer-Flecken, A. / Han, X. / Nicolai, D. / Satheeswaran, G. / Wang, N. C. / Cai, Jianqing / Charl, A. / Cosfeld, J. / Gao, Yu / Grulke, O. / Henkel, M. / Hollfeld, K. P. / Killer, C. / Knieps, A. / König, R. / Neubauer, O. / Rack, M. / Sandri, N. / Sereda, S. / Schweer, B. / Wang, Erhui / Wei, Yanling | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Published in: | Physics of plasmas, 25 (2018) 7, S. 072502 - |
Imprint: |
[S.l.]
American Institute of Physics
2018
|
DOI: |
10.1063/1.5033353 |
Document Type: |
Journal Article |
Research Program: |
Plasma-Wall-Interaction |
Link: |
Published on 2018-07-03. Available in OpenAccess from 2019-07-03. Published on 2018-07-03. Available in OpenAccess from 2019-07-03. |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1063/1.5033353 in citations.
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. |