title: New edge coherent mode providing continuous transport in long-pulse H-mode plasmas.
abstract: An electrostatic coherent mode near the electron diamagnetic frequency (20-90 kHz) is observed in the steep-gradient pedestal region of long pulse H-mode plasmas in the Experimental Advanced Superconducting Tokamak, using a newly developed dual gas-puff-imaging system and diamond-coated reciprocating probes. The mode propagates in the electron diamagnetic direction in the plasma frame with poloidal wavelength of ∼8  cm. The mode drives a significant outflow of particles and heat as measured directly with the probes, thus greatly facilitating long pulse H-mode sustainment. This mode shows the nature of dissipative trapped electron mode, as evidenced by gyrokinetic turbulence simulations.
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: H Q
authors.initials: HQ
authors.lastname: Wang
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: G S
authors.initials: GS
authors.lastname: Xu
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: B N
authors.initials: BN
authors.lastname: Wan
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: S Y
authors.initials: SY
authors.lastname: Ding
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China and General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA.
authors.forename: H Y
authors.initials: HY
authors.lastname: Guo
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: L M
authors.initials: LM
authors.lastname: Shao
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: S C
authors.initials: SC
authors.lastname: Liu
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: X Q
authors.initials: XQ
authors.lastname: Xu
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: E
authors.initials: E
authors.lastname: Wang
authors.affiliation: Association EURATOM-DTU, Physics Department, DK 2800 Kgs. Lyngby, Denmark.
authors.forename: N
authors.initials: N
authors.lastname: Yan
authors.affiliation: Association EURATOM-DTU, Physics Department, DK 2800 Kgs. Lyngby, Denmark.
authors.forename: V
authors.initials: V
authors.lastname: Naulin
authors.affiliation: Association EURATOM-DTU, Physics Department, DK 2800 Kgs. Lyngby, Denmark.
authors.forename: A H
authors.initials: AH
authors.lastname: Nielsen
authors.affiliation: Association EURATOM-DTU, Physics Department, DK 2800 Kgs. Lyngby, Denmark.
authors.forename: J Juul
authors.initials: JJ
authors.lastname: Rasmussen
authors.affiliation: General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA.
authors.forename: J
authors.initials: J
authors.lastname: Candy
authors.affiliation: Fourth State Research, 503 Lockhart Drive, Austin, Texas 78704-4335, USA.
authors.forename: R
authors.initials: R
authors.lastname: Bravenec
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: Y W
authors.initials: YW
authors.lastname: Sun
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: T H
authors.initials: TH
authors.lastname: Shi
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: Y F
authors.initials: YF
authors.lastname: Liang
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: R
authors.initials: R
authors.lastname: Chen
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: W
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: L
authors.initials: L
authors.lastname: Wang
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: L
authors.initials: L
authors.lastname: Chen
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: N
authors.initials: N
authors.lastname: Zhao
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: Y L
authors.initials: YL
authors.lastname: Li
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: Y L
authors.initials: YL
authors.lastname: Liu
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: G H
authors.initials: GH
authors.lastname: Hu
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: X Z
authors.initials: XZ
authors.lastname: Gong