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 …
Abstract The effect of magnetic field ripple on tokamak plasma without turbulence is studied numerically and augmented with a reduced analytical model that includes neoclassical processes in the presence non-axisymmetric perturbation stochastic …
Abstract Two ways for producing a transport barrier through strong shear of the E × B poloidal flow have been investigated using GYSELA gyrokinetic simulations in flux-driven regime. The first one uses an external momentum (i.e. vorticity) source …
Abstract Magnetic confinement fusion offers the promise of sustainable and safe energy production on Earth. Advanced experimental scenarios exploit fascinating yet uncommon ability confined plasmas to bifurcate into states enhanced performance upon …
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 …