%0 Journal Article
%A Estrada, T.
%A Maragkoudakis, E.
%A Carralero, D.
%A Windisch, T.
%A L Velasco, J.
%A Killer, C.
%A Andreeva, T.
%A Geiger, J.
%A Dinklage, A.
%A Krämer-Flecken, A.
%A Wurden, G. A.
%A Beurskens, M.
%A Bozhenkov, S.
%A Damm, H.
%A Fuchert, G.
%A Pasch, E.
%T Impact of magnetic islands on plasma flow and turbulence in W7-X
%J Nuclear fusion
%V 61
%@ 1741-4326
%C Vienna
%I IAEA
%M FZJ-2021-03051
%P 096011
%D 2021
%X The effect of magnetic islands on plasma flow and turbulence has been experimentally investigated in the stellarator W7-X. Magnetic configurations with the 5/5 magnetic island positioned at the plasma edge, inside the last closed flux surface, are studied. The main diagnostic used in the present work is a V-band Doppler reflectometer that allows the measurement of the perpendicular plasma flow and density fluctuations with good spatial resolution. A characteristic signature of the 5/5 magnetic island is clearly detected in the perpendicular flow profile. The comparison of the experimental flow and the neoclassically driven E × B flow indicates that the island contribution to the flow is maximum at the island boundaries and close to zero at the island O-point. Besides, a reduction in the density fluctuation level is found nearby the island O-point. The similarities between these observations and those found in other devices and in gyrokinetic simulations are discussed.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000680171700001
%R 10.1088/1741-4326/ac146f
%U https://juser.fz-juelich.de/record/894124