title: Spectrally resolved motional Stark effect measurements on ASDEX Upgrade.
abstract: A spectrally resolved Motional Stark Effect (MSE) diagnostic has been installed at ASDEX Upgrade. The MSE data have been fitted by a forward model providing access to information about the magnetic field in the plasma interior [R. Reimer, A. Dinklage, J. Geiger et al., Contrib. Plasma Phys. 50, 731-735 (2010)]. The forward model for the beam emission spectra comprises also the fast ion Dα signal [W. W. Heidbrink and G. J. Sadler, Nucl. Fusion 34, 535-615 (1994)] and the smearing on the CCD-chip. The calculated magnetic field data as well as the revealed (dia)magnetic effects are consistent with the results from equilibrium reconstruction solver. Measurements of the direction of the magnetic field are affected by unknown and varying polarization effects in the observation.
authors.affiliation: Max-Planck-Institut für Plasmaphysik, EURATOM Association, Teilinstitut Greifswald, Wendelsteinstraße 1, 17491 Greifswald, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Reimer
authors.forename: A
authors.initials: A
authors.lastname: Dinklage
authors.forename: R
authors.initials: R
authors.lastname: Fischer
authors.forename: J
authors.initials: J
authors.lastname: Hobirk
authors.forename: T
authors.initials: T
authors.lastname: Löbhard
authors.forename: A
authors.initials: A
authors.lastname: Mlynek
authors.forename: M
authors.initials: M
authors.lastname: Reich
authors.forename: L
authors.initials: L
authors.lastname: Sawyer
authors.forename: R
authors.initials: R
authors.lastname: Wolf