This title appears in the Scientific Report :
2021
Please use the identifier:
http://dx.doi.org/10.1088/1741-4326/ac146f in citations.
Please use the identifier: http://hdl.handle.net/2128/29611 in citations.
Impact of magnetic islands on plasma flow and turbulence in W7-X
Impact of magnetic islands on plasma flow and turbulence in W7-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 wor...
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Personal Name(s): | Estrada, T. |
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Maragkoudakis, E. / Carralero, D. / Windisch, T. / L Velasco, J. / Killer, C. / Andreeva, T. / Geiger, J. / Dinklage, A. / Krämer-Flecken, A. (Corresponding author) / Wurden, G. A. / Beurskens, M. / Bozhenkov, S. / Damm, H. / Fuchert, G. / Pasch, E. | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Published in: | Nuclear fusion, 61 (2021) S. 096011 |
Imprint: |
Vienna
IAEA
2021
|
DOI: |
10.1088/1741-4326/ac146f |
Document Type: |
Journal Article |
Research Program: |
Plasma-Wand-Wechselwirkung |
Link: |
Get full text Published on 2021-07-29. Available in OpenAccess from 2022-07-29. |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/29611 in citations.
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. |