title: Momentum transport from nonlinear mode coupling of magnetic fluctuations
abstract: A cause of observed anomalous plasma momentum transport in a reversed-field pinch is determined experimentally. Magnetohydrodynamic theory predicts that nonlinear interactions involving triplets of tearing modes produce internal torques that redistribute momentum. Evidence for the nonlinear torque is acquired by detecting the correlation of momentum redistribution with the mode triplets, with the elimination of one of the modes in the triplet, and with the external driving of one of the modes.
authors.affiliation: University of Wisconsin Department of Physics,1150 University Avenue, Madison, Wisconsin 53706, USA.
authors.initials: AK
authors.lastname: Hansen
authors.initials: AF
authors.lastname: Almagri
authors.initials: D
authors.lastname: Craig
authors.lastname: Den Hartog DJ
authors.initials: CC
authors.lastname: Hegna
authors.initials: SC
authors.lastname: Prager
authors.initials: JS
authors.lastname: Sarff