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Abstract. The Stellarator Theory Division at the Greifswald Branch has
been concentrating on widening the scope of theoretical work related to
W7-X. Some of such areas are the quality of finite- magnetic
surfaces, energetic-particle-driven Alfvén eigenmode, resistively driven
drift and ion-temperature-gradient-driven instabilities. New results
pertaining to these issues are: i) MHD GAEs in W7-X-type equilibria are
discovered and the first 3d drift-kinetic formulation of interaction with
energetic particles is developed as nonlinear eigenvalue problem
analytically and computationally; ii) for the first time, mode structures of
globally calculated resistive drift instabilities with poloidal mode numbers
of
(103) and exhibiting the relative importance of toroidal
vs. helical coupling are obtained in a toroidal stellarator; iii) for the
first time, nonlinear saturation levels of kinetic ITG modes are obtained
with energy conservation in a
-pinch, iv) fixed-boundary-PIES
W7-X-type high-
equilibria - well converged on an NEC-SX5 - show
even 5/5 islands to be very thin.
IAEA 2001