title: Suppression of large edge-localized modes in high-confinement DIII-D plasmas with a stochastic magnetic boundary.
abstract: A stochastic magnetic boundary, produced by an applied edge resonant magnetic perturbation, is used to suppress most large edge-localized modes (ELMs) in high confinement (H-mode) plasmas. The resulting H mode displays rapid, small oscillations with a bursty character modulated by a coherent 130 Hz envelope. The H mode transport barrier and core confinement are unaffected by the stochastic boundary, despite a threefold drop in the toroidal rotation. These results demonstrate that stochastic boundaries are compatible with H modes and may be attractive for ELM control in next-step fusion tokamaks.
authors.affiliation: General Atomics, San Diego, California, USA.
authors.forename: T E
authors.initials: TE
authors.lastname: Evans
authors.forename: R A
authors.initials: RA
authors.lastname: Moyer
authors.forename: P R
authors.initials: PR
authors.lastname: Thomas
authors.forename: J G
authors.initials: JG
authors.lastname: Watkins
authors.forename: T H
authors.initials: TH
authors.lastname: Osborne
authors.forename: J A
authors.initials: JA
authors.lastname: Boedo
authors.forename: E J
authors.initials: EJ
authors.lastname: Doyle
authors.forename: M E
authors.initials: ME
authors.lastname: Fenstermacher
authors.forename: K H
authors.initials: KH
authors.lastname: Finken
authors.forename: R J
authors.initials: RJ
authors.lastname: Groebner
authors.forename: M
authors.initials: M
authors.lastname: Groth
authors.forename: J H
authors.initials: JH
authors.lastname: Harris
authors.forename: R J
authors.initials: RJ
authors.lastname: La Haye
authors.forename: C J
authors.initials: CJ
authors.lastname: Lasnier
authors.forename: S
authors.initials: S
authors.lastname: Masuzaki
authors.forename: N
authors.initials: N
authors.lastname: Ohyabu
authors.forename: D G
authors.initials: DG
authors.lastname: Pretty
authors.forename: T L
authors.initials: TL
authors.lastname: Rhodes
authors.forename: H
authors.initials: H
authors.lastname: Reimerdes
authors.forename: D L
authors.initials: DL
authors.lastname: Rudakov
authors.forename: M J
authors.initials: MJ
authors.lastname: Schaffer
authors.forename: G
authors.initials: G
authors.lastname: Wang
authors.forename: L
authors.initials: L
authors.lastname: Zeng