Application of three-dimensional (3D) resonant magnetic perturbations, for the purpose of controlling edge localized modes (ELMs) in high confinement tokamak fusion operation, routinely pumps out a significant fraction of the plasma density during the discharge. Understanding the density pump-out phenomenon due to 3D fields is a longstanding challenging issue. This work reports a self-consistent toroidal model, that allows successful initial value simulation of the density pump-out observed in DIII-D ELM suppression experiments. The radial particle flux associated with the neoclassical toroidal viscosity, which is substantially enhanced due to thermal particle drift resonances at the top of pedestal, is shown to play an important role in producing the density pump-out effect.
Role of NTV Particle Flux in Density Pumpout during ELM Control by RMP
Piovesan P;
2018
Abstract
Application of three-dimensional (3D) resonant magnetic perturbations, for the purpose of controlling edge localized modes (ELMs) in high confinement tokamak fusion operation, routinely pumps out a significant fraction of the plasma density during the discharge. Understanding the density pump-out phenomenon due to 3D fields is a longstanding challenging issue. This work reports a self-consistent toroidal model, that allows successful initial value simulation of the density pump-out observed in DIII-D ELM suppression experiments. The radial particle flux associated with the neoclassical toroidal viscosity, which is substantially enhanced due to thermal particle drift resonances at the top of pedestal, is shown to play an important role in producing the density pump-out effect.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
