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Experimental Evidence of Momentum Transport Induced by an Up-Down Asymmetric Magnetic Equilibrium in Toroidal Plasmas

By Y. Camenen, A. Bortolon, B. P. Duval, L. Federspiel, A. G. Peeters, F. J. Casson, W. A. Hornsby, A. N. Karpushov, F. Piras, O. Sauter, A. P. Snodin and G. Szepesi


The first experimental evidence of parallel momentum transport generated by the up-down asymmetry of a toroidal plasma is reported. The experiments, conducted in the Tokamak a` Configuration Variable, were motivated by the recent theoretical discovery of ion-scale turbulent momentum transport induced by an up-down asymmetry in the magnetic equilibrium. The toroidal rotation gradient is observed to depend on the asymmetry in the outer part of the plasma leading to a variation of the central rotation by a factor of 1.52. The direction of the effect and its magnitude are in agreement with theoretical predictions for the eight possible combinations of plasma asymmetry, current, and magnetic field

Publisher: 'American Physical Society (APS)'
Year: 2010
DOI identifier: 10.1103/PhysRevLett.105.135003
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