Interplay of turbulent transport and Reynolds stress in drift-wave turbulence.
basic_science · Level V
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- Record sourced from PubMed, PMID 40411114.
- Also identified by DOI 10.1103/PhysRevE.111.045207.
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Abstract
The dynamical interplay between turbulent particle transport (Γ) and Reynolds stress (ℜ) at the edge of toroidal magnetically confined plasmas is experimentally investigated on the basis of the cross-coupling between density and potential fluctuations in drift-wave turbulence. Both Γ and ℜ are found to be temporally anticorrelated, with a dynamical coupling of the density and potential fluctuations as an agent in their interplay. The density-potential coupling is shown for the first time to be dynamically related to the Reynolds stress in agreement with the E×B vortex-tilting mechanism. Consistently, a temporal deterioration of the coupling links the evolution of particle transport to the drop in the Reynolds stress. Small-scale contributions (k_{θ}ρ_{s}>0.6) are shown to play a key role via a mutual stabilization-destabilization process.