Turbulence in the separatrix region associated with the L - H transition in the ASDEX tokamak and the W7-AS stellarator
- 1 August 1996
- journal article
- Published by IOP Publishing in Plasma Physics and Controlled Fusion
- Vol. 38 (8) , 1267-1271
- https://doi.org/10.1088/0741-3335/38/8/020
Abstract
The temporal behaviour of turbulence associated with the L - H transition is described. In the ASDEX tokamak the level of density fluctuations in a narrow region inside the separatrix and in the scrape-off layer is quenched on a 100 timescale. After the L - H transition fluctuations of a different nature are destabilized which, however, show no marked influence on transport across the barrier. The time development of magnetic turbulence is closely correlated with density turbulence. A comparison is made with edge turbulence in the W7-AS stellarator H-mode where edge turbulence during the transition evolves on a similar timescale.Keywords
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