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| Hauptseite > Publikationsdatenbank > Impact of magnetic islands on plasma flow and turbulence in W7-X |
| Hauptseite > Publikationsdatenbank > Impact of magnetic islands on plasma flow and turbulence in W7-X |
| Journal Article | FZJ-2021-03051 |
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2021
IAEA
Vienna
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Please use a persistent id in citations: http://hdl.handle.net/2128/29611 doi:10.1088/1741-4326/ac146f
Abstract: 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.
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