title: Observation of velocity-independent electron transport in the reversed field pinch.
abstract: Confinement of runaway electrons has been observed for the first time in a reversed field pinch during improved-confinement plasmas in the Madison Symmetric Torus. Energy-resolved hard-x-ray flux measurements have been used to determine the velocity dependence of the electron diffusion coefficient, utilizing computational solutions of the Fokker-Planck transport equation. With improved-confinement, the fast electron diffusivity drops by 2 orders of magnitude and is independent of velocity. This suggests a change in the transport mechanism away from stochastic magnetic field diffusion.
authors.affiliation: Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA. roconnell@wisc.edu
authors.forename: R
authors.initials: R
authors.lastname: O'Connell
authors.forename: D J
authors.initials: DJ
authors.lastname: Den Hartog
authors.forename: C B
authors.initials: CB
authors.lastname: Forest
authors.forename: J K
authors.initials: JK
authors.lastname: Anderson
authors.forename: T M
authors.initials: TM
authors.lastname: Biewer
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: S C
authors.initials: SC
authors.lastname: Prager
authors.forename: J S
authors.initials: JS
authors.lastname: Sarff
authors.forename: S D
authors.initials: SD
authors.lastname: Terry
authors.forename: R W
authors.initials: RW
authors.lastname: Harvey