title: Effect of neoclassical toroidal viscosity on error-field penetration thresholds in tokamak plasmas.
abstract: A model for field-error penetration is developed that includes nonresonant as well as the usual resonant field-error effects. The nonresonant components cause a neoclassical toroidal viscous torque that keeps the plasma rotating at a rate comparable to the ion diamagnetic frequency. The new theory is used to examine resonant error-field penetration threshold scaling in Ohmic tokamak plasmas. Compared to previous theoretical results, we find the plasma is less susceptible to error-field penetration and locking, by a factor that depends on the nonresonant error-field amplitude.
authors.affiliation: University of Wisconsin, Madison, Wisconsin 53706-1609, USA.
authors.forename: A J
authors.initials: AJ
authors.lastname: Cole
authors.forename: C C
authors.initials: CC
authors.lastname: Hegna
authors.forename: J D
authors.initials: JD
authors.lastname: Callen