title: Measurement of internal magnetic field fluctuations in a reversed-field pinch by Faraday rotation.
abstract: Magnetic field fluctuations (and the associated current perturbation) have been measured in the core of a high-temperature reversed-field pinch using a newly developed fast-polarimetry system. Radial magnetic field fluctuation levels of approximately 1% are measured in standard-reversed-field pinch discharges which increase to approximately 4% during the sawtooth crash (enhanced dynamo). The fluctuation level is reduced fourfold for high-confinement plasmas where the core-resonant tearing modes are suppressed.
authors.affiliation: Electrical Engineering Department, University of California-Los Angeles, Los Angeles, California 90095, USA.
authors.forename: W X
authors.initials: WX
authors.lastname: Ding
authors.forename: D L
authors.initials: DL
authors.lastname: Brower
authors.forename: S D
authors.initials: SD
authors.lastname: Terry
authors.forename: D
authors.initials: D
authors.lastname: Craig
authors.forename: S C
authors.initials: SC
authors.lastname: Prager
authors.forename: J S
authors.initials: JS
authors.lastname: Sarff
authors.forename: J C
authors.initials: JC
authors.lastname: Wright