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Abstract

A gyrokinetic eigenvalue code has been developed for computing global ion temperature gradient (ITG) -related instabilities in tokamak configurations. Although trapped ion dynamics are not yet considered in this model, it contains full finite Larmor radius and finite orbit width effects of circulating ions. Non-adiabatic trapped electron dynamics are included through a bounce-averaged drift kinetic equation. Differences between the local ballooning approximation and the global approach are presented and discussed. The possible coupling between the trapped electron mode (TEM) and the toroidal-ITG mode is also investigated. Finally, the evolution of the spectrum of these different instabilities is studied for varying central negative magnetic shear configurations.

Additional information

Authors: BRUNNER S, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);FIVAZ M, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);VACLAVIK J, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Article: Fusion Theory Proceedings of the Seventh European Fusion Theory Conference, Forschungszentrum Jülich (1998) pp. 45-52
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