title: Transport of parallel momentum induced by current-symmetry breaking in toroidal plasmas.
abstract: The symmetry of a physical system strongly impacts on its properties. In toroidal plasmas, the symmetry along a magnetic field line usually constrains the radial flux of parallel momentum to zero in the absence of background flows. By breaking the up-down symmetry of the toroidal currents, this constraint can be relaxed. The parallel asymmetry in the magnetic configuration then leads to an incomplete cancellation of the turbulent momentum flux across a flux surface. The magnitude of the subsequent toroidal rotation increases with the up-down asymmetry and its sign depends on the direction of the toroidal magnetic field and plasma current. Such a mechanism offers new insights in the interpretation and control of the intrinsic toroidal rotation in present day experiments.
authors.affiliation: Department of Physics, University of Warwick, Coventry CV4 7AL, UK.
authors.forename: Y
authors.initials: Y
authors.lastname: Camenen
authors.forename: A G
authors.initials: AG
authors.lastname: Peeters
authors.forename: C
authors.initials: C
authors.lastname: Angioni
authors.forename: F J
authors.initials: FJ
authors.lastname: Casson
authors.forename: W A
authors.initials: WA
authors.lastname: Hornsby
authors.forename: A P
authors.initials: AP
authors.lastname: Snodin
authors.forename: D
authors.initials: D
authors.lastname: Strintzi