title: Spatiotemporal structure of the interaction between turbulence and flows at the L-H transition in a toroidal plasma.
abstract: The spatiotemporal behavior of the interaction between turbulence and flows has been studied close to the L-H transition threshold conditions in the edge region (ρ≥0.7) of TJ-II plasmas. The temporal dynamics of the interaction displays an oscillatory behavior with a characteristic predator-prey relationship. The spatial evolution of this turbulence-flow oscillation pattern has been measured, showing both radial outward and inward propagation velocities of the turbulence-flow front. The results indicate that the edge shear flow linked to the L-H transition can behave either as a slowing-down, damping mechanism of outward propagating turbulent-flow oscillating structures, or as a source of inward propagating turbulence-flow events.
authors.affiliation: Laboratorio Nacional de Fusión, Asociación Euratom-CIEMAT, 28040, Madrid, Spain. teresa.estrada@ciemat.es
authors.forename: T
authors.initials: T
authors.lastname: Estrada
authors.forename: C
authors.initials: C
authors.lastname: Hidalgo
authors.forename: T
authors.initials: T
authors.lastname: Happel
authors.forename: P H
authors.initials: PH
authors.lastname: Diamond