Reynolds stress and edge turbulence in TEXTOR: A comparison between simulations and experiment

We discuss the modeling of turbulence by means of a simulation code and compare these simulations to experimental results recently obtained in TEXTOR using a new Reynolds stress probe. The probe, reciprocating on a fast manipulator, allows to track poloidal and radial electric field and density fluctuations, which permits us to compute the (E × B)-velocity fluctuations as well as the Reynolds stress, the fluctuation driven particle fluxes and correlation functions. The simulations are based on the Hasegawa-Wakatani model, completed with curvature and neutral drag terms. We further investigate the potential role Reynolds stresses play in driving or damping the background flows, with the aid of a one dimensional fluid model in which the toroidal geometry is correctly taken into account, while various sources and sinks like viscosity, interaction with neutrals and Reynolds stresses are included.