title: A new beam emission polarimetry diagnostic for measuring the magnetic field line angle at the plasma edge of ASDEX Upgrade.
abstract: A new edge beam emission polarimetry diagnostic dedicated to the measurement of the magnetic field line angle has been installed on the ASDEX Upgrade tokamak. The new diagnostic relies on the motional Stark effect and is based on the simultaneous measurement of the polarization direction of the linearly polarized π (parallel to the electric field) and σ (perpendicular to the electric field) lines of the Balmer line Dα. The technical properties of the system are described. The calibration procedures are discussed and first measurements are presented.
authors.affiliation: Max-Planck-Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany.
authors.forename: E
authors.initials: E
authors.lastname: Viezzer
authors.affiliation: Max-Planck-Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Dux
authors.affiliation: Max-Planck-Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany.
authors.forename: M G
authors.initials: MG
authors.lastname: Dunne
authors.affiliation: Max-Planck-Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany.