title: Feedback stabilization of multiple resistive wall modes.
abstract: Active feedback stabilization of multiple independent resistive wall modes is experimentally demonstrated in a reversed-field pinch plasma. A reproducible simultaneous suppression of several nonresonant resistive wall modes is achieved. Coupling of different modes due to the limited number of the feedback coils is observed in agreement with theory. The feedback stabilization of nonresonant RWMs also has an effect on tearing modes that are resonant in the central plasma, leading to a significant prolongation of the discharge pulse.
authors.affiliation: Division of Fusion Plasma Physics (Association EURATOM/VR), Alfvén Laboratory, Royal Institute of Technology, 10044 Stockholm, Sweden.
authors.forename: P R
authors.initials: PR
authors.lastname: Brunsell
authors.forename: D
authors.initials: D
authors.lastname: Yadikin
authors.forename: D
authors.initials: D
authors.lastname: Gregoratto
authors.forename: R
authors.initials: R
authors.lastname: Paccagnella
authors.forename: T
authors.initials: T
authors.lastname: Bolzonella
authors.forename: M
authors.initials: M
authors.lastname: Cavinato
authors.forename: M
authors.initials: M
authors.lastname: Cecconello
authors.forename: J R
authors.initials: JR
authors.lastname: Drake
authors.forename: A
authors.initials: A
authors.lastname: Luchetta
authors.forename: G
authors.initials: G
authors.lastname: Manduchi
authors.forename: G
authors.initials: G
authors.lastname: Marchiori
authors.forename: L
authors.initials: L
authors.lastname: Marrelli
authors.forename: P
authors.initials: P
authors.lastname: Martin
authors.forename: A
authors.initials: A
authors.lastname: Masiello
authors.forename: F
authors.initials: F
authors.lastname: Milani
authors.forename: S
authors.initials: S
authors.lastname: Ortolani
authors.forename: G
authors.initials: G
authors.lastname: Spizzo
authors.forename: P
authors.initials: P
authors.lastname: Zanca