APS Logo

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.

–

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