title: Classical impurity ion confinement in a toroidal magnetized fusion plasma.
abstract: High-resolution measurements of impurity ion dynamics provide first-time evidence of classical ion confinement in a toroidal, magnetically confined plasma. The density profile evolution of fully stripped carbon is measured in MST reversed-field pinch plasmas with reduced magnetic turbulence to assess Coulomb-collisional transport without the neoclassical enhancement from particle drift effects. The impurity density profile evolves to a hollow shape, consistent with the temperature screening mechanism of classical transport. Corroborating methane pellet injection experiments expose the sensitivity of the impurity particle confinement time to the residual magnetic fluctuation amplitude.
authors.affiliation: Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA. stkumar@wisc.edu
authors.forename: S T A
authors.initials: ST
authors.lastname: Kumar
authors.forename: D J
authors.initials: DJ
authors.lastname: Den Hartog
authors.forename: K J
authors.initials: KJ
authors.lastname: Caspary
authors.forename: R M
authors.initials: RM
authors.lastname: Magee
authors.forename: V V
authors.initials: VV
authors.lastname: Mirnov
authors.forename: B E
authors.initials: BE
authors.lastname: Chapman
authors.forename: D
authors.initials: D
authors.lastname: Craig
authors.forename: G
authors.initials: G
authors.lastname: Fiksel
authors.forename: J S
authors.initials: JS
authors.lastname: Sarff