APS Logo

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.



–

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