Effect of Magnetic Drifts on Global Ion-Temperature-Gradient Modes in Helical Configurations
Ion-Temperature-Gradient (ITG) modes are studied in straght stellarator configurations with a global approach based on time-evolution, Particle-In-Cell, finite element formulation of the gyrpkinetic equations. The global code GYGLES has been adapted to the helical symmetry and will also serve as a benchmark for a 3-D gyrokinetic code now under development. In this paper we consider a straight heliac configuration characterized by virtually zero shear, elongated bean-shaped cross sections, and a helical curvature of th magnetic axis. We study in particular the marginal stabilitiy points and the transition from 'slab-like' or 'Trapped Ion mode' to interchange-like regimes for different mode number values.
Bibliographic Reference: Article: Theory of Fusion Plasmas, (1999), 427-433
Record Number: 199910865 / Last updated on: 1999-06-25
Original language: en
Available languages: en