title: Pedestal magnetic field measurements using a motional Stark effect polarimeter.
abstract: Temperature-controlled, 0.15 nm interference filters were installed on an edge-viewing system of the motional Stark effect (MSE) polarimeter on the DIII-D tokamak. The upgraded system provides a factor of two reduction in the bandpass compared to the previous design, and linear control of the bandpass, which is unaltered by wavelength tuning. With the new system, there is a reduced dependence of the inferred polarization angle on the filter wavelength calibration. Recent measurements from the calibrated edge-viewing system show increased agreement with other MSE arrays.
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA. lanctot1@llnl.gov
authors.forename: M J
authors.initials: MJ
authors.lastname: Lanctot
authors.forename: C T
authors.initials: CT
authors.lastname: Holcomb
authors.forename: S L
authors.initials: SL
authors.lastname: Allen
authors.forename: M E
authors.initials: ME
authors.lastname: Fenstermacher
authors.forename: T C
authors.initials: TC
authors.lastname: Luce