title: Experimental evidence of reduced plasma flow damping with quasisymmetry.
abstract: Measurements of plasma flow damping have been made in the helically symmetric experiment using a biased electrode to impulsively spin the plasma. There are two time scales in the evolution of the plasma flow, for both the spin-up and relaxation. Compared to a configuration with the quasisymmetry broken, the flow in the quasisymmetric configuration rises more slowly and to a higher value at bias turn-on, and decays more slowly at bias turn-off. The decays of the flows are significantly faster than the neoclassical prediction.
authors.affiliation: Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI, USA.
authors.forename: S P
authors.initials: SP
authors.lastname: Gerhardt
authors.forename: J N
authors.initials: JN
authors.lastname: Talmadge
authors.forename: J M
authors.initials: JM
authors.lastname: Canik
authors.forename: D T
authors.initials: DT
authors.lastname: Anderson