%0 Journal Article
%A Windisch, T.
%A Krämer-Flecken, A.
%A Velasco, JL
%A Könies, A.
%A Nührenberg, C.
%A Grulke, O.
%A Klinger, T.
%T Poloidal correlation reflectometry at W7-X: radial electric field and coherent fluctuations
%J Plasma physics and controlled fusion
%V 59
%N 10
%@ 1361-6587
%C Bristol
%I IOP Publ.
%M FZJ-2017-06363
%P 105002 -
%D 2017
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000406839500002
%R 10.1088/1361-6587/aa759b
%U https://juser.fz-juelich.de/record/837450