Characteristics of edge-localized modes in the experimental advanced superconducting tokamak (EAST)

Publication: Research - peer-reviewJournal article – Annual report year: 2012

  • Author: Jiang, M.

    Chinese Academy of Sciences, China

  • Author: Xu, G.S.

    Chinese Academy of Sciences, China

  • Author: Xiao, C.

    University of Saskatchewan, Canada

  • Author: Guo, H. Y.

    Tri Alpha Energy Inc., United States

  • Author: Wan, B. N.

    Chinese Academy of Sciences, China

  • Author: Wang, H. Q.

    Chinese Academy of Sciences, China

  • Author: Wang, L.

    Chinese Academy of Sciences, China

  • Author: Zhang, L.

    Chinese Academy of Sciences, China

  • Author: Naulin, Volker

    Plasma physics and fusion energy, Department of Physics, Technical University of Denmark, Fysikvej, 2800, Kgs. Lyngby, Denmark

  • Author: Gan, K. F.

    Chinese Academy of Sciences, China

  • Author: Wang, D. S.

    University of Science and Technology of China, China

  • Author: Duan, Y. M.

    Chinese Academy of Sciences, China

  • Author: Yan, Ning

    Plasma physics and fusion energy, Department of Physics, Technical University of Denmark, Frederiksborgvej 399 Postboks 49, 4000, Roskilde, Denmark

  • Author: Liu, P.

    Chinese Academy of Sciences, China

  • Author: Ding, S. Y.

    Chinese Academy of Sciences, China

  • Author: Zhang, W.

    Chinese Academy of Sciences, China

  • Author: Liu, S. C.

    Chinese Academy of Sciences, China

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Edge-localized modes (ELMs) are the focus of tokamak edge physics studies because the large heat loads associated with ELMs have great impact on the divertor design of future reactor-grade tokamaks such as ITER. In the experimental advanced superconducting tokamak (EAST), the first ELMy high confinement modes (H-modes) were obtained with 1 MW lower hybrid wave power in conjunction with wall conditioning by lithium (Li) evaporation and real-time Li powder injection. The ELMs in EAST at this heating power are mostly type-III ELMs. They were observed close to the H-mode threshold power and produced small energy dumps (1-2% of the stored energy). Type-III ELMs produced a time-averaged peak heat flux of about 2 MW m(-2) on the target plate, a value which is similar to 10 times larger than that of ELM-free phases. A few isolated and large type-I-like ELM events were also observed in EAST with an energy loss of up to 5% of the stored energy. Statistically, the ELM frequencies are several hundred hertz and the frequency appears to decrease with q(95), the safety factor at 95% of the flux surface. When an ion cyclotron resonance frequency wave was injected during the H-mode phases, the ELM repetition frequency increased immediately. The frequency and amplitude of type-III ELMs can be effectively influenced by puffing impurity argon gas.
Original languageEnglish
JournalPlasma Physics and Controlled Fusion
Publication date2012
Volume54
Issue9
Pages095003
ISSN0741-3335
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 2

Keywords

  • PHYSICS, ELMY H-MODES, DIII-D, ASDEX UPGRADE, I ELMS, COLLISIONALITY REGIME, FREQUENCY CONTROL, PELLET INJECTION, HIGH-DENSITY, PEDESTAL, PLASMA
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