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Sawtooth oscillations in the tokamak plasma are often preceded by a faster MHD precursor with m/n=1/1 as the dominant mode. The most famous model to explain the sawtooth crash as a periodic magnetic reconnection of plasma inner regions with different magnetic helecity has been introduced by B.B Kadomstev. Later, a few experimental features that contradict the Kadomstev model have been found. Several explanations have been put forward to clarify these discrepancies. However, so far no reliable model for the internal disruption in general and for the sawtooth oscillation in particular has been found.
On the Tore Supra tokamak, series of experiments have been conducted to shed some light on the fast n/m=1/1 model topology and its influence on transport properties in the plasma center. It is suggested that the m=1 mode cannot be described as an ideal kink only, and resistive effects play an important role in development of the mode. Possible mechanisms that influence the m=1 mode behaviour prior and the sawtooth crash and their links to the evolution of the central q-profile will be discussed in this paper.

Additional information

Authors: UDINTSEV V ET AL, Departement de Recherches sur la Fusion Controlee, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An oral paper given at: 31st EPS Conference on Controlled Fusion and Plasma Physics Organised by: CCLRC Rutherford Appleton Laboratory (GB); EURATOM/UKAEA Fusion Association (GB); Imperial College London Held at: Imperial College London (
Availability: Available from Association EURATOM-CEA, Departement de Recherches sur la Fusion Controlee, CEA Cadarache, F-13108 St Paul-Lez-Durance, France Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail:
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