Spontaneous profile self-organization in a simple realization of drift-wave turbulence

• DOI: 10.1063/1.4944819
• Publication Date: 2016-03-25T19:33:14Z
• Authors: L. Cui; A. Ashourvan; S. C. Thakur; R. Hong; P. H. Diamond; G. R. Tynan
• Keywords: Reynolds stress; Pressure gradient

We report the observation of a transport bifurcation that occurs by spontaneous self-organization drift-wave and shear flow system in linear plasma device. As we increase magnetic field above threshold (BCr = 1200 G), global transition occurs, with steepening mean density ion pressure profiles, onset strong E×B shearing, reduction turbulence, improved turbulent radial particle transport. An abrupt appears graph flux versus gradient. Hysteresis gradient further confirms this bifurcation. The total Reynolds work on sharply increases threshold. This correlates steepness, which suggests stress-driven plays an essential role A change turbulence feature from drift waves (DWs) to mix DWs temperature gradients also coincides Interesting phenomena related are reported; local inward flux, co-existence electron features, self-sustained axial absent momentum input.