Condensation of microturbulence-generated shear flows into global modes
In full flux-surface computer studies of tokamak edge turbulence, a spectrum of shear flows is found to control the turbulence level and not just the conventional (0,0)-mode flows. Flux tube domains too small for the large poloidal scale lengths of the continuous spectrum tend to overestimate the flows and thus underestimate the transport. It is shown analytically and numerically that under certain conditions dominant (0,0)-mode flows independent of the domain size develop, essentially through an analog of Bose-Einstein condensation for the shear flows.
Hallatschek
K
Max-Planck Institut fur Plasmaphysik, EURATOM-IPP Association, D-85748 Garching, Germany.