title: Spatial and temporal analysis of DIII-D 3D magnetic diagnostic data.
abstract: An extensive set of magnetic diagnostics in DIII-D is aimed at measuring non-axisymmetric "3D" features of tokamak plasmas, with typical amplitudes ∼10-3to 10-5of the total magnetic field. We describe hardware and software techniques used at DIII-D to condition the individual signals and analysis to estimate the spatial structure from an ensemble of discrete measurements. Applications of the analysis include detection of non-rotating MHD instabilities, plasma control, and validation of MHD stability and 3D equilibrium models.
authors.affiliation: General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA.
authors.forename: E J
authors.initials: EJ
authors.lastname: Strait
authors.affiliation: General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA.
authors.forename: J D
authors.initials: JD
authors.lastname: King
authors.affiliation: Columbia University, New York, New York 10027-6900, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: Hanson
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543-0451, USA.
authors.forename: N C
authors.initials: NC
authors.lastname: Logan