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Abstract

The MHD behaviour connected with edge localised modes (ELMs) is studied using fast sample rate fluctuation diagnostics. It is found that ELMs on ASDEX are generally preceded by a coherent MHD mode of medium poloidal mode number (m = 10-15). At the onset of the ELM the mode behaviour changes to a turbulent one, leading to an outflux of heat and particles. These results are related to a model by Kerner and Jakoby, which explains the ELM as a non-linear coupling of free-surface modes of resistive ballooning character. This model is in good agreement with the experimental findings.

Additional information

Authors: ZOHM H, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);WAGNER F, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);ENDLER M, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);GERNHARDT J, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);MERTENS V, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);HOLZHAUER E, Institut für Plasmaforschung, Stuttgart (DE);KERNER V, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Article: Nuclear Fusion, Vol. 32 (1992) No. 3, pp. 489-494
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