How turbulence fronts induce plasma spin-up
Related Experiment Videos
Y Kosuga1,2, S-I Itoh1,2, P H Diamond3
1Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan.
Physical Review. E
|April 19, 2017
Abstract:
A calculation which describes the spin-up of toroidal plasmas by the radial propagation of turbulence fronts with broken parallel symmetry is presented. The associated flux of parallel momentum is calculated by using a two-scale direct-interaction approximation in the weak turbulence limit. We show that fluctuation momentum spreads faster than mean flow momentum. Specifically, the turbulent flux of wave momentum is stronger than the momentum pinch. The scattering of fluctuation momentum can induce edge-core coupling of toroidal flows, as observed in experiments.