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Abstract

In the TFR Tokamak bursts of density fluctuations are observed which coincide in space and time with the sawtooth disruptions of the plasma. These are measured with a CO(2) laser scattering experiment. The temporal evolution of the soft X-ray signal and the scattered light signal is analysed. The dispersive properties, localisation and amplitude data of these fluctuations are discussed. These observations demonstrate the existence of a specific turbulence in the disruption phenomenon. An m=1 kink-like instability and a specific turbulence associated with a new helical shape of the plasma are two experimentally proven aspects of the sawtooth relaxation phenomenon. They are probably two key elements of its mechanism.

Additional information

Authors: ANDREOLETTI J, CEA, Département de Recherches sur la Fusion Contrôllée, Saint-Paul-lez-Durance (FR);GERVAIS F, CEA, Département de Recherches sur la Fusion Contrôllée, Saint-Paul-lez-Durance (FR);OLIVAIN J, CEA, Département de Recherches sur la Fusion Contrôllée, Saint-Paul-lez-Durance (FR);QUEMENEUR A, CEA, Département de Recherches sur la Fusion Contrôllée, Saint-Paul-lez-Durance (FR);TRUC A, Ecole Polytechnique, Palaiseau (FR);GRESILLON D, Ecole Polytechnique, Palaiseau (FR)
Bibliographic Reference: Article: Plasma Physics and Controlled Fusion, Vol, 31 (1989), N0. 4, pp. 643-649
Record Number: 198910576 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: en