Parallel shear flow instability in the tokamak edge

F. Schwander, G. Chiavassa, G. Ciraolo, Ph Ghendrih, L. Isoardi, A. Paredes, Y. Sarazin, E. Serre, P. Tamain

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

16 Citas (Scopus)

Resumen

The transition between the core and scrape-off layer of a tokamak corresponds to a marked momentum shear layer, owing to sheath acceleration on limiters which drives near-sonic flows along the plasma magnetic field in the scrape-off layer, and a parallel shear flow instability can possibly be triggered. The possibility of this instability driven by the velocity gradient is investigated numerically, using a minimum model of particle and parallel momentum transport in the edge of a tokamak, in a computational domain modelling a limiter plasma with background turbulence modelled as an effective diffusion. It is found that unstable regions can exist in the vicinity of a limiter, in agreement with experimental findings, when momentum radial transport - and therefore coupling between SOL and core flows - is sufficiently weak. Instability is reinforced by core rotation, and is found to be maximum downstream of the limiter (with respect to the core plasma flow).

Idioma originalInglés
Páginas (desde-hasta)S601-S604
PublicaciónJournal of Nuclear Materials
Volumen415
N.º1 SUPPL
DOI
EstadoPublicada - 1 ago 2011
Publicado de forma externa

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