title: Neoclassical toroidal plasma viscosity torque in collisionless regimes in tokamaks.
abstract: Bumpiness in a magnetic field enhances the magnitude of the plasma viscosity and increases the rate of the plasma flow damping. A general solution of the neoclassical toroidal plasma viscosity (NTV) torque induced by nonaxisymmetric magnetic perturbation (NAMP) in the collisionless regimes in tokamaks is obtained in this Letter. The plasma angular momentum can be strongly changed, when there is a small deviation of the toroidal symmetry caused by a NAMP of the order of 0.1% of the toroidal field strength.
authors.affiliation: Institute for Energy Research-Plasma Physics, Forschungszentrum Jülich, Association EURATOM-FZJ, Trilateral Euregio Cluster, 52425 Jülich, Germany. y.sun@fz-juelich.de
authors.forename: Y
authors.initials: Y
authors.lastname: Sun
authors.forename: Y
authors.initials: Y
authors.lastname: Liang
authors.forename: K C
authors.initials: KC
authors.lastname: Shaing
authors.forename: H R
authors.initials: HR
authors.lastname: Koslowski
authors.forename: C
authors.initials: C
authors.lastname: Wiegmann
authors.forename: T
authors.initials: T
authors.lastname: Zhang