title: Measurement of the resistive-wall-mode stability in a rotating plasma using active MHD spectroscopy.
abstract: The stability of the resistive-wall mode (RWM) in DIII-D plasmas above the conventional pressure limit, where toroidal plasma rotation in the order of a few percent of the Alfve n velocity is sufficient to stabilize the n=1 RWM, has been probed using the technique of active MHD spectroscopy at frequencies of a few Hertz. The measured frequency spectrum of the plasma response to externally applied rotating resonant magnetic fields is well described by a single-mode approach and provides an absolute measurement of the damping rate and the natural mode rotation frequency of the stable RWM.
authors.affiliation: Columbia University, New York, New York, USA.
authors.forename: H
authors.initials: H
authors.lastname: Reimerdes
authors.forename: M S
authors.initials: MS
authors.lastname: Chu
authors.forename: A M
authors.initials: AM
authors.lastname: Garofalo
authors.forename: G L
authors.initials: GL
authors.lastname: Jackson
authors.forename: R J
authors.initials: RJ
authors.lastname: La Haye
authors.forename: G A
authors.initials: GA
authors.lastname: Navratil
authors.forename: M
authors.initials: M
authors.lastname: Okabayashi
authors.forename: J T
authors.initials: JT
authors.lastname: Scoville
authors.forename: E J
authors.initials: EJ
authors.lastname: Strait