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(EXP5/22) Enhanced Particle Confinement and Turbulence Reduction Due to ExB Shear in the TEXTOR Tokamak

J. A. Boedo¹⁾, D. S. Gray¹⁾, P. W. Terry²⁾, S. Jachmich³⁾, G. Tynan¹⁾, R. W. Conn¹⁾, and the TEXTOR Team^4)
 
1) University of California, San Diego, U.S.A.
²⁾ University of Winsconsin, Madison, U.S.A.
³⁾ ERM/KMS, Brussels, Belgium
⁴⁾ IPP FZ-Jülich, Jülich, Germany

Abstract.  The scaling of turbulence, turbulent particle flux and cross-phase with shear is measured and compared with various analytical theories. It is found that the scaling can be expressed as a second-order polynomial and that the cross-phase plays a key role in the suppression of the particle flux. The variable rate of shear, kept below the value required to produce a Low-to-High particle confinement transition, was obtained by changing, in a shot to shot basis, the voltage applied to an electrode introduced 4 cm into the plasma.

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