On the Source of Turbulence by Fuelling

Abstract

In order to understand observations that the wall conditioning, wall material and the way of fuelling of neutral particles influence the core confinement in magnetic confinement devices, possible roles of particle fuelling to enhance edge turbulence are discussed. Bootstrapping of edge turbulence by the coupling with the particle source and turbulence in SoL is shown to enhance of edge turbulence (i.e. fuelling fuels turbulence). Inference of this enhanced edge turbulence is discussed, including an additional role that makes the H-mode state more robust.