Particle and power deposition on divertor targets in EAST H-mode plasmas

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

  • Author: Wang, L.

    Chinese Academy of Science, China

  • Author: Xu, G.S.

    Chinese Academy of Science, China

  • Author: Guo, H.Y.

    Chinese Academy of Science, China

  • Author: Chen, R.

    Chinese Academy of Science, China

  • Author: Ding, S.

    Chinese Academy of Science, China

  • Author: Gan, K.F.

    Chinese Academy of Science, China

  • Author: Gao, X.

    Chinese Academy of Science, China

  • Author: Gong, X.Z.

    Chinese Academy of Science, China

  • Author: Jiang, M.

    Chinese Academy of Science, China

  • Author: Liu, P.

    Chinese Academy of Science, China

  • Author: Liu, S.C.

    Chinese Academy of Science, China

  • Author: Luo, G.N.

    Chinese Academy of Science, China

  • Author: Ming, T.F.

    Chinese Academy of Science, China

  • Author: Wan, B.N.

    Chinese Academy of Science, China

  • Author: Wang, D.S.

    Chinese Academy of Science, China

  • Author: Wang, F.M.

    Chinese Academy of Science, China

  • Author: Wang, H.Q.

    Chinese Academy of Science, China

  • Author: Wu, Zhuang

    Chinese Academy of Science, China

  • Author: Yan, Ning

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

  • Author: Zhang, L.

    Chinese Academy of Science, China

  • Author: Zhang, W.

    Chinese Academy of Science, China

  • Author: Zhang, X.J.

    Chinese Academy of Science, China

  • Author: Zhu, S.Z.

    Chinese Academy of Science, China

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The effects of edge-localized modes (ELMs) on divertor particle and heat fluxes were investigated for the first time in the Experimental Advanced Superconducting Tokamak (EAST). The experiments were carried out with both double null and lower single null divertor configurations, and comparisons were made between the H-mode plasmas with lower hybrid current drive (LHCD) and those with combined ion cyclotron resonance heating (ICRH). The particle and heat flux profiles between and during ELMs were obtained from Langmuir triple-probe arrays embedded in the divertor target plates. And isolated ELMs were chosen for analysis in order to reduce the uncertainty resulting from the influence of fast electrons on Langmuir triple-probe evaluation during ELMs. The power deposition obtained from Langmuir triple probes was consistent with that from the divertor infra-red camera during an ELM-free period. It was demonstrated that ELM-induced radial transport predominantly originated from the low-field side region, in good agreement with the ballooning-like transport model and experimental results of other tokamaks. ELMs significantly enhanced the divertor particle and heat fluxes, without significantly broadening the SOL width and plasma-wetted area on the divertor target in both LHCD and LHCD + ICRH H-modes, thus posing a great challenge for the next-step high-power, long-pulse operation in EAST. Increasing the divertor-wetted area was also observed to reduce the peak heat flux and particle recycling at the divertor target, hence facilitating long-pulse H-mode operation. The particle and heat flux profiles during ELMs appeared to exhibit multiple peak structures, and were analysed in terms of the behaviour of ELM filaments and the flux tubes induced by modified magnetic topology during ELMs.
Original languageEnglish
JournalNuclear Fusion
Publication date2012
Volume52
Issue6
Pages063024
ISSN0029-5515
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 8

Keywords

  • Plasma physics
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