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.