Experimental evidence of momentum transport induced by an up-down asymmetric magnetic equilibrium in toroidal plasmas |
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Authors: | Camenen Y Bortolon A Duval B P Federspiel L Peeters A G Casson F J Hornsby W A Karpushov A N Piras F Sauter O Snodin A P Szepesi G |
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Affiliation: | Centre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick, Coventry CV4 7AL, UK. |
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Abstract: | 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 à 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 1.5-2. 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. |
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