\textbf{Progress on Disruption Event Characterization and Forecasting in Tokamaks}

POSTER

Abstract

Disruption prediction and avoidance is critical in ITER and reactor-scale tokamaks. Results from the disruption event characterization and forecasting (DECAF) research effort are shown for multiple tokamaks. Analysis of KSTAR, MAST, and NSTX databases shows low disruptivity paths to high beta operation. DECAF analysis of a \textasciitilde 10$^{\mathrm{4}}$ plasma database with only 5 DECAF events predicts disruptions with 91.2{\%} true positives and 8.7{\%} false negatives. Automated analysis of rotating MHD modes allows identification of disruption event chains including coupling, bifurcation, locking, and potential triggering by other events. DECAF can provide an early disruption forecast (on transport timescales) allowing disruption avoidance through profile control. New hardware to evaluate this analysis in real-time is now being configured for installation on KSTAR. TRANSP predictive analyses with as few as 4 (of 6) NBI sources computes plasmas at $\beta_{N}$ \textgreater 3.5 with 100{\%} non-inductive current drive - a novel operating regime for KSTAR disruption prediction studies. Analysis of MAST has uncovered resistive wall modes at high $\beta _{\mathrm{N}}$. Mode shape and growth rate are significantly altered by conducting structure differences compared to NSTX. Wall stabilization is computed to increase in MAST-U due to new divertor plates.

Authors

  • Y.S. Park

    Columbia U., Columbia University

  • S.A. Sabbagh

    Columbia U., Columbia University

  • J. Berkery

    Columbia University, Columbia U.

  • J.H. Ahn

    Columbia U., Columbia University

  • Jim Bialek

    Columbia U., Columbia University

  • Y. Jiang

    Columbia U., Columbia University

  • J.D. Riquezes

    Columbia U.

  • J.G. Bak

    NFRI

  • S.H. Hahn

    NFRI

  • Jayhyun Kim

    NFRI

  • Jinseok Ko

    NFRI, National Fusion Research Institute

  • J. Lee

    NFRI

  • S. W. Yoon

    NFRI, National Fusion Research Institute

  • C. Ham

    CCFE

  • Andrew Kirk

    CCFE

  • L. Kogan

    CCFE

  • D. Ryan

    CCFE

  • A. Thornton

    CCFE

  • Mark Boyer

    PPPL, Princeton Plasma Physics Laboratory

  • Keith Erickson

    PPPL, Princeton Plasma Physics Lab

  • Zhirui Wang

    Princeton Plasma Physics Laboratory., PPPL