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P: Fachverband Plasmaphysik

P 22: Helmholtz Graduate School for Plasma Physics II

P 22.3: Fachvortrag

Donnerstag, 20. März 2014, 11:40–12:05, SPA HS202

Interaction between the neoclassical equilibrium and ITG turbulence in gyrokinetic simulations — •Michael Oberparleiter and Frank Jenko — Max-Planck-Institut für Plasmaphysik, EURATOM-Assoziation, Boltzmannstraße 2, D-85748 Garching

While the fundamental theory of neoclassical transport in magnetic confinement devices was established decades ago, it still holds a number of relevant open questions. We use the gyrokinetic code Gene to investigate a potential interaction mechanism between turbulent and neoclassical physics via modifications of the zonal flow pattern by the neoclassical radial electric field. As a model system, an external sinusoidal electrostatic potential is imposed on ITG turbulence in the flux tube limit. This allows us to study the impact of long and intermediate wavelength radial electric fields on turbulent structures for a wide range of paremeters. Based on these results radially global simulations with and without neoclassical effects are performed to investigate the impact of the true neoclassical radial electric field. Additionally, we test some of the analytical propositions how neoclassical transport is modified near the magnetic axis, where the orbit width becomes of the order of the minor radius of the flux surface. In particular, a heat source localised on the axis is used to show the nonlocality of the ion heat transport.