We report on the first direct numerical simulation of drift-Alfvénwave turbulence in three-dimensional magnetic field geometries.It is found that the local metric has significant influence oninstability and transport and that local shear contributes as theprincipal damping mechanism in low-global-shear field configurations.An example of such configurations are advanced stellarator fusionconcepts. The transition from simple tokamak to stellarator geometryand effects on plasma edge turbulence and anomalous transport are investigated in flux-tube models of the equilibria and suitableinterpolations. In the conclusion we outline a possible optimization inregard to turbulent transport reduction of stellarator configurations.
A comparative study of transport in stellarators and tokamaks