This visualization shows the turbulence front from the plasma edge being spread inward in multiscale interaction with the evolving background profile under the central heat source. Eventually, the whole volume becomes turbulent, with the spatial turbulence amplitude distribution being just enough to produce the outward heat transport to expel the centrally deposited heat to the edge. The edge turbulence source is continuously fed by the heat flux from the core. This is how the plasma profile, the heat source and the turbulence self-organize.
Credit: Dave Pugmire, ORNL.