Poloidal correlation reflectometry at W7-X: radial electric field and coherent fluctuations

Poloidal correlation reflectometry measurements during the first plasma campaign of the optimized stellarator Wendelstein-7X are presented. The radial electric field is determined and a comparison with neoclassical calculations and shows good qualitative agreement. The measured density fluctuation s...

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Bibliographic Details
Published inPlasma physics and controlled fusion Vol. 59; no. 10; pp. 105002 - 105012
Main Authors Windisch, T, Krämer-Flecken, A, Velasco, JL, Könies, A, Nührenberg, C, Grulke, O, Klinger, T
Format Journal Article
LanguageEnglish
Published IOP Publishing 02.08.2017
Subjects
Alfvén eigenmodes
MHD modes
radial electric field
reflectometry
stellarator
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Summary:Poloidal correlation reflectometry measurements during the first plasma campaign of the optimized stellarator Wendelstein-7X are presented. The radial electric field is determined and a comparison with neoclassical calculations and shows good qualitative agreement. The measured density fluctuation spectrum exhibits coherent low- and high-frequency modes. Magneto-hydrodynamic (MHD) modeling results suggest that the coherent fluctuations are caused by stable MHD-modes and Alfvén waves.
Bibliography:PPCF-101447.R2
ISSN:0741-3335
1361-6587
DOI:10.1088/1361-6587/aa759b