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Modifications of turbulence and turbulent transport associated with a bias-induced confinement transition in the Large Plasma Device

Phys. Plasmas 16, 012304 (2009); doi:10.1063/1.3059410

Published 21 January 2009

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T. A. Carter1,2 and J. E. Maggs1
1Department of Physics and Astronomy, University of California, Los Angeles, California 90095-1547, USA
2Center for Multiscale Plasma Dynamics, University of California, Los Angeles, California 90095-1547, USA
Azimuthal flow is driven in the edge of the Large Plasma Device (LAPD) [W. Gekelman et al., Rev. Sci. Instrum. 62, 2875 (1991)] through biasing a section of the vacuum vessel relative to the plasma source cathode. As the applied bias exceeds a threshold, a transition in radial particle confinement is observed, evidenced by a dramatic steepening in the density profile, similar to the L- to H-mode transition in toroidal confinement devices. The threshold behavior and dynamic behavior of radial transport is related to flow penetration and the degree of spatial overlap between the flow shear and density gradient profiles. An investigation of the changes in turbulence and turbulent particle transport associated with the confinement transition is presented. Two-dimensional cross-correlation measurements show that the spatial coherence of edge turbulence in LAPD changes significantly with biasing. The azimuthal correlation in the turbulence increases dramatically, while the radial correlation length is little altered. Turbulent amplitude is reduced at the transition, particularly in electric field fluctuations, but the dominant change observed is in the cross-phase between density and electric field fluctuations. The changes in cross-phase lead to a suppression and then apparent reversal of turbulent particle flux as the threshold is exceeded. ©2009 American Institute of Physics
History: Received 14 July 2008; accepted 9 December 2008; published 21 January 2009
Permalink: http://link.aip.org/link/?PHPAEN/16/012304/1
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