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Abstract

Although sawtooth (ST) instabilities have been observed and studied for many years in all tokamaks, the understanding of the underlying physical mechanism is still incomplete. Furthermore, recent experiments have shown that the usual, triangular shaped, Ohmic sawteeth can exhibit a range of shapes during auxiliary Electron Cyclotron Resonance Heating (ECRH). Different types of sawtooth shapes have been observed on TCV (Tokamak à Configuration Variable) with ECRH depending on the plasma and ECRH launching configuration and parameters. Reports observations of non-standard sawtooth behaviour during ECRH, obtained with these high temporal resolution diagnostics. An interpretation of the results is offered on the basis of a recently developed theoretical model.

Additional information

Authors: CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ;ECOLE POLYTECHNIQUE FEDERALE, ;LAUSANNE (CH),
Bibliographic Reference: Article: 26th EPS Conference on Controlled Fusion and Plasma Physics, (1999)
Record Number: 199911076 / Last updated on: 1999-08-06
Category: PUBLICATION
Original language: en
Available languages: en