TY  - JOUR
AU  - Estrada, T.
AU  - Maragkoudakis, E.
AU  - Carralero, D.
AU  - Windisch, T.
AU  - L Velasco, J.
AU  - Killer, C.
AU  - Andreeva, T.
AU  - Geiger, J.
AU  - Dinklage, A.
AU  - Krämer-Flecken, A.
AU  - Wurden, G. A.
AU  - Beurskens, M.
AU  - Bozhenkov, S.
AU  - Damm, H.
AU  - Fuchert, G.
AU  - Pasch, E.
TI  - Impact of magnetic islands on plasma flow and turbulence in W7-X
JO  - Nuclear fusion
VL  - 61
SN  - 1741-4326
CY  - Vienna
PB  - IAEA
M1  - FZJ-2021-03051
SP  - 096011
PY  - 2021
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000680171700001
DO  - DOI:10.1088/1741-4326/ac146f
UR  - https://juser.fz-juelich.de/record/894124
ER  -