We investigate the interplay between ion temperature gradient (ITG) and parallel velocity (PVG) instabilities in cylindrical geometry using a Water-bag model 5D gyrokinetic simulations with modified version of GYSELA code. The provides an analytical …
Abstract The effects of transport barriers on impurity transport, specifically helium (He) and tungsten (W), are investigated using the global, flux-driven, full-F, 5D gyrokinetic code GYSELA. barrier is induced by triggering E×B shear via an …
Abstract Poloidal flows and avalanches play a key role in tokamak plasma selforganization by suppressing turbulence sheared flow regions, contributing to the formation of weak transport barriers. These structures, predicted GYSELA simulations …
Abstract We utilize the global full-F gyrokinetic code GYSELA to analyze nonlocal transport in presence of modulated heat source, period which is range a timescale. In submarginal stable case, it observed that localized and time-modulated source can …
Abstract This study is motivated by experiments on Tore Supra and WEST tokamaks where a deepening of the E × B velocity—governed radial electric field r —near edge observed when safety factor decreases in L-mode plasmas. Flux-driven global …
In situ workflows are inescapable to fully leverage exascale architectures. They can be complex build, however, because simulation and data analytics come from two different software ecosystems with their own paradigms programming models. This work …
The effect of toroidal rotation on both turbulent and neoclassical transport tungsten (W) in tokamaks is investigated using the flux-driven, global, nonlinear 5D gyrokinetic code GYSELA. Nonlinear simulations are carried out with different levels …
Abstract Reduced quasilinear and nonlinear (gradient-driven) models with scale separations, commonly used to interpret experiments forecast turbulent transport levels in magnetised plasmas, are tested against without separations (flux-driven). Two …