title: Dual array 3D electron cyclotron emission imaging at ASDEX Upgrade.
abstract: In a major upgrade, the (2D) electron cyclotron emission imaging diagnostic (ECEI) at ASDEX Upgrade has been equipped with a second detector array, observing a different toroidal position in the plasma, to enable quasi-3D measurements of the electron temperature. The new system will measure a total of 288 channels, in two 2D arrays, toroidally separated by 40 cm. The two detector arrays observe the plasma through the same vacuum window, both under a slight toroidal angle. The majority of the field lines are observed by both arrays simultaneously, thereby enabling a direct measurement of the 3D properties of plasma instabilities like edge localized mode filaments.
authors.affiliation: FOM-Institute DIFFER, Dutch Institute for Fundamental Energy Research, 3430 BE Nieuwegein, The Netherlands.
authors.forename: I G J
authors.initials: IG
authors.lastname: Classen
authors.affiliation: Department of Applied Science, University of California at Davis, Davis, California 95616, USA.
authors.forename: C W
authors.initials: CW
authors.lastname: Domier
authors.affiliation: Department of Applied Science, University of California at Davis, Davis, California 95616, USA.
authors.forename: N C
authors.initials: NC
authors.lastname: Luhmann
authors.affiliation: FOM-Institute DIFFER, Dutch Institute for Fundamental Energy Research, 3430 BE Nieuwegein, The Netherlands.
authors.forename: A V
authors.initials: AV
authors.lastname: Bogomolov
authors.affiliation: Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, 85748 Garching, Germany.
authors.forename: W
authors.initials: W
authors.lastname: Suttrop
authors.affiliation: Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, 85748 Garching, Germany.
authors.forename: J E
authors.initials: JE
authors.lastname: Boom
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA.
authors.forename: B J
authors.initials: BJ
authors.lastname: Tobias
authors.affiliation: FOM-Institute DIFFER, Dutch Institute for Fundamental Energy Research, 3430 BE Nieuwegein, The Netherlands.
authors.forename: A J H
authors.initials: AJ
authors.lastname: Donné