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Abstract

Recent experimental studies have shown the importance of finite Beta effects for energy transport, therefore a study of the electromagnetic effects on micro-instabilities has been performed.

The gyrokirietic equation has been generalized to the electromagnetic case, by including the parallel component of the vector potential. Electron dynamics has been taken into account with the drift-kinetic approximation, including also trapped electrons. The plasma is thus described by the quasi-neutrality equation and the parallel component of Ampere's law. The two-equations system is then resolved globally by means of a spectral approach.

Results from the electromagnetic extension of the existing global gyrokinetic spectral code, GLOGYSTO, are presented here: they show the stabilizing role of finite Beta on toroidal ion temperature gradient (ITG) modes, even in presence of trapped electrons; trapped electrons modes (TEM), which are essentially electrostatic drift waves propagating in the electron diamagnetic direction, are on the contrary, unaffected.

A study for different magnetic shear profiles, including negative shear, is also presented; results are in agreement with the electrostatic case: even in the presence of finite Beta, negative magnetic shear does not account for a complete stabilization of the ITG modes. odes.

Additional information

Authors: FALCHETTO G.L, Centre de Recherches en Physique des Plasmas, EURATOM Association-Confederation Suisse, Ecole Polytechnique Federale de Lausanne (CH);VACLAVIK J, Centre de Recherches en Physique des Plasmas, EURATOM Association-Confederation Suisse, Ecole Polytechnique Federale de Lausanne (CH)
Bibliographic Reference: An article published in: Theory of Fusion Plasmas (2000), pp.321-326
Record Number: 200013673 / Last updated on: 2001-09-18
Category: PUBLICATION
Original language: en
Available languages: en