How turbulence fronts induce plasma spin-up.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 28415373.
- Also identified by DOI 10.1103/PhysRevE.95.031203.
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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.