title: Experimental evidence of momentum transport induced by an up-down asymmetric magnetic equilibrium in toroidal plasmas.
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.
authors.affiliation: Centre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick, Coventry CV4 7AL, UK.
authors.forename: Y
authors.initials: Y
authors.lastname: Camenen
authors.forename: A
authors.initials: A
authors.lastname: Bortolon
authors.forename: B P
authors.initials: BP
authors.lastname: Duval
authors.forename: L
authors.initials: L
authors.lastname: Federspiel
authors.forename: A G
authors.initials: AG
authors.lastname: Peeters
authors.forename: F J
authors.initials: FJ
authors.lastname: Casson
authors.forename: W A
authors.initials: WA
authors.lastname: Hornsby
authors.forename: A N
authors.initials: AN
authors.lastname: Karpushov
authors.forename: F
authors.initials: F
authors.lastname: Piras
authors.forename: O
authors.initials: O
authors.lastname: Sauter
authors.forename: A P
authors.initials: AP
authors.lastname: Snodin
authors.forename: G
authors.initials: G
authors.lastname: Szepesi