Abstract
The dynamics of turbulence and plasma flows has been studied experimentally by means of Doppler reflectometry during the transition from low to high confinement mode in the stellarator TJ-II. Close to the transition threshold, gradual transitions are achieved showing an intermediate, oscillatory transient phase that facilitates the study of the mechanisms involved in the transition. A coupling between sheared flows and turbulence level is measured which reveals a characteristic predator-prey behavior consistent with the L-H transition models based on turbulence-driven flows.
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Corrections were made to this article on 3 November 2010. The issue date was initially published as October.