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In tokamaks such as Tore Supra, the plasma confinement magnetic structure can be severely affected when magnetohydrodynamic (MHD) instabilities are destabilized. Analysis techniques are used to study two specific examples of MHD activity related to the m=2, n=1 mode. On Tore Supra, the onset of this mode have strong consequences on the stability of non inductive discharges. A regular and persistent sawtooth-like regime is observed on the electronic temperature leading to a significant degradation of the central confinement. Heat exhaust and particle balance are also essential parameters to achieve stationary discharges. On Tore Supra, these are studied with the ergodic divertor. For optimal operating conditions of the ergodic divertor, the growth of the m=2, n=1 mode can lead to a sudden destruction of magnetic equilibrium. For both cases, understanding and characterization of mechanisms leading to activity are fundamental to obtain stationary discharges.

Additional information

Authors: TURLUR S, Université de Paris-Sud, UFR Scientifique d'Orsay (FR)
Bibliographic Reference: Report: EUR-CEA-FC-1599 FR (1997) 184pp.
Availability: Available from Association Euratom-CEA, CEN Cadarache, 13108 Saint-Paul-lez Durance (FR)
Record Number: 199710425 / Last updated on: 1997-04-23
Original language: en,fr
Available languages: en,fr