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Using an interface with the ideal MHD equilibrium code CHEASE, numerical simulations are performed in realistic Tokamak geometry with the gyrokinetic flux tube code GENE [1, 2]. As a starting point in view of a more general study of geometrical effects on various types of micro‐turbulence, elongation and triangularity scans are carried out in the ITG regime. In particular, the main dependence of the linear growth rate on elongation is identified to result from the modification of the spatial profile gradients. Non‐linear simulations have also been performed, and the influence of geometry on the Dimits shift [3] has been investigated. In order to address the issue of non‐local effects in turbulent transport, some of the standard flux tube assumptions are being released in the GENE code, which will thus be extended to allow for radial variations of the equilibrium quantities. The current state of this code development is presented.

Effects of geometry on linear and non-linear gyrokinetic simulations, and development of a global version of the GENE code