Safe and efficient access to ELM suppression in KSTAR using low-n edge localized RMP

ORAL

Abstract

An edge localization of 3D fields proposes a unique path of a 3D field to safely access the ELM-suppressed High confinement mode (H-mode) from low confinement mode (L-mode) phases with improved plasma performance. Such an edge-localized resonant magnetic perturbation (ERMP) [1] is essential to minimize disruptive core components of low-n RMP while maintaining its efficiency in ELM suppression for the entire period of H-mode. The core reduction in ERMP also expands the ELM suppression window, increasing the safety margin for feedback-based ELM control by 100%. In addition, the ERMP reduces rotation damping and density degradation while maintaining ELM suppression. The confinement improvement from ERMP can be explained by a reduction in neoclassical transport and fast ion orbit losses, as demonstrated in GPEC and NubDEC simulations. The successful validation and applications of ERMP show promising aspects of low-n 3D field optimization to avoid the unnecessary component of the 3D field for ELM control.



*This work was supported by DOE Contracts DE-AC02-09CH11466 (PPPL)

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Publication: [1] S.M. Yang et al., NF60,096023

Presenters

  • SeongMoo Yang

    • Princeton Plasma Physics Laboratory
    • Princeton Plasma Physics Laboratory, U.S.A.
    • PPPL

Authors

  • SeongMoo Yang

    • Princeton Plasma Physics Laboratory
    • Princeton Plasma Physics Laboratory, U.S.A.
    • PPPL

  • Jong-Kyu Park

    • Princeton Plasma Physics Laboratory
    • Princeton Plasma Physics Laboratory, U.S.A.
    • PPPL

  • Nikolas C Logan

    • Lawrence Livermore Natl Lab
    • LLNL

  • Y.M. Jeon

    • Korea Institute of Fusion Energy

  • Qiming Hu

    • Princeton Plasma Physics Laboratory
    • PPPL

  • SangKyeun Kim

    • Princeton University
    • Princeton University, U.S.A.
    • PPPL
    • PU

  • Y. In

    • Ulsan Natl Inst of Sci & Tech
    • UNIST

  • Won-Ha Ko

    • Korea Institute of Fusion Energy
    • KFE
    • Natl Fusion Res Inst
    • Korea Institute of Fusion Energy, Korea

  • Gunyoung Park

    • Korea Institute of Fusion Energy
    • KFE

  • J.H. Lee

    • Korea Institute of Fusion Energy
    • Korea Institute of Fusion Energy, Korea

  • Jongha Lee

    • KFE
    • Korea Institute of Fusion Energy
    • Korea Institute of Fusion Energy, Korea

  • Tongnyeol Rhee

    • Korea Institute of Fusion Energy

  • Sanghee Hahn

    • Korea Institute of Fusion Energy
    • Korea institute of Fusion Energy
    • Korea Institute of Fusion Energy, Korea
    • KFE

  • Minwoo Kim

    • Korea Institute of Fusion Energy
    • KFE
    • Korean Intitute of Fusion Energy

  • Giwook Shin

    • Korea institute of Fusion Energy
    • Korea Institute of Fusion Energy
    • KFE

  • Ricardo Shousha

    • Princeton University

  • Y.S. Na

    • Seoul National University
    • Seoul National University, Korea