A plasma regime with long sustained highly peaked ion temperature in the KSTAR tokamak

ORAL

Abstract

A new type of plasma operating scenario in KSTAR has been developed by preventing the H-mode transition. The specific method is to maintain a low density and upper single null configuration, which are unfavorable conditions for H-mode transition, when a neutral beam of moderate power is applied. The main feature of the scenario is maintaining a high ion temperature of 10keV or higher for a long time. The overall performance is comparable to a conventional H-mode or above. It also shows a low-loop voltage, which is advantageous for the steady-state operation. Compared to the hybrid plasma, a well-known high-performance plasma regime, we conclude that novelty lies in a high portion of fast ions that stabilize core turbulence during long pulse duration. We coin this new regime as the fast ion regulated enhancement (FIRE) mode and think that the FIRE mode is worth studying for future commercial fusion plasma operations.

*This work was supported by Ministry of Science and ICT under KFE R&D Program of "KSTAR Experimental Collaboration and Fusion Plasma Research (KFE-EN2101-12)", National R&D Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science & ICT (NRF-2021M1A7A4091135), and the National Supercomputing Center with supercomputing resources including technical support (KSC-2020-CRE-0364).

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Presenters

  • Hyunsun Han

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

Authors

  • Hyunsun Han

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

  • Sangjin Park

    • Seoul National University, Korea

  • Choongki Sung

    • Korea Advanced Institute of Science and Technology
    • Korea Advanced Institute of Science and Technology, Korea

  • J.S. Kang

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

  • Y.H. Lee

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

  • J. Chung

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

  • Taik Soo S Hahm

    • Seoul National University
    • Seoul National University, Korea

  • B.S. Kim

    • Seoul National University, Korea
    • Seoul National University

  • Jong-Kyu Park

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

  • Jun Gyo Bak

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

  • Minsoo Cha

    • Seoul National University, Korea

  • Gyungjin Choi

    • Seoul National University, Korea
    • Seoul National University

  • M. J. Choi

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

  • Jinwoo Gwak

    • Seoul National University, Korea

  • Sanghee Hahn

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

  • Ju-hyueok Jang

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

  • Kwan Chul Lee

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

  • J. Kim

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

  • SangKyeun Kim

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

  • Woong Chae Kim

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

  • Jinseok Ko

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

  • Won-Ha Ko

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

  • Chanyoung Lee

    • Seoul National University, Korea

  • Jongha Lee

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

  • J.H. Lee

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

  • J.K. Lee

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

  • J.P. Lee

    • Hanyang Univeristy
    • Hanyang University
    • Hanyang University, Korea

  • K. D Lee

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

  • Young-Seok Park

    • Columbia University
    • Columbia U.
    • Columbia University, U.S.A.
    • Columbia Uni.
    • Columbia Univ

  • J.M. Seo

    • Seoul National University, Korea
    • Seoul National University

  • SeongMoo Yang

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

  • Si-Woo Yoon

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

  • Y.S. Na

    • Seoul National University
    • Seoul National University, Korea