In absence of external torque, plasma rotation in tokamaks results from a balance between collisional magnetic braking and turbulent drive. The outcome this competition cooperation is essential to determine the flow. A reduced model, supported by …
Abstract Reynolds stress is a key facet of turbulence self-organization. In the magnetized plasmas controlled fusion devices, zonal flows that are driven by averaged modify confinement performance. We address this problem with full- f gyrokinetic …
A model of E × B staircases is proposed based on a wave kinetic equation coupled to poloidal momentum equation. staircase pattern idealized as periodic radial structure zonal shear layers that bound regions propagating packets, viewed avalanches. …
Abstract Impurity transport is numerically investigated for different types of impurity, such as helium (He), argon (Ar), and tungsten (W). Both turbulent neoclassical transports are treated self-consistently using the full- f gyrokinetic software …
Summary Communication and computation overlapping techniques have been introduced in the five-dimensional gyrokinetic codes GYSELA GKV. In order to anticipate some of exa-scale requirements, these were ported modern accelerators, Xeon Phi KNL Tesla P …
The role of poloidal convective cells—i.e. low frequency axisymmetric modes the electric potential—on transport processes is studied with full-F gyrokinetic code GYSELA. In order to understand impact cells, we apply a numerical filter cells and …
Poloidal asymmetries of impurities are commonly observed experimentally. Density asymmetry is already known to impact significantly the neoclassical prediction impurity fluxes. In this article, effect pressure and anisotropy on flux derived …
A penalization technique is applied in global and flux driven gyrokinetic simulations to model a limiter configuration. The immersed boundary implemented terms of restoring force cold distribution function. It acts as perfect heat absorber. Parallel …