Comparison of KBM stabilization by shaping effects at NSTX and conventional aspect ratios

POSTER

Abstract

Linear electromagnetic simulations of KBM stabilization by shaping effects at NSTX aspect ratio and high plasma beta are performed using the global gyrokinetic PIC code XGC [1,2]. Linear KBM stability at NSTX aspect ratio is found to be highly sensitive to shaping effects. Magnetic geometries with high elongation and triangularity are included. The effects of compressional magnetic perturbations are approximated via a modification to the particle drifts, and this approximation is used in a benchmark between the global gyrokinetic codes XGC, GEM [3], and GENE [4]. Profile-consistent magnetic equilibria are generated for each beta value and geometry, and single toroidal mode numbers are considered. KBM stabilization by shaping effects is compared at NSTX and conventional aspect ratios.

[1] S. Ku et al., Phys. Plasmas 25, 056107 (2018)

[2] M. D. J. Cole et al., Phys. Plasmas 28, 034501 (2021)

[3] Y. Chen and S. E. Parker, J. Comput. Phys. 220, 839 (2007)

[4] T. Görler et al., J. Comput. Phys. 230, 7053 (2011)

Presenters

  • Amil Sharma

    • Princeton Plasma Physics Laboratory

Authors

  • Amil Sharma

    • Princeton Plasma Physics Laboratory

  • Michael Cole

    • Princeton Plasma Physics Laboratory
    • PPPL

  • Yang Chen

    • University of Colorado, Boulder

  • David R Hatch

    • University of Texas at Austin
    • Institute for Fusion Studies, University of Texas at Austin

  • Benjamin J Sturdevant

    • Princeton Plasma Physics Laboratory

  • Robert Hager

    • Princeton Plasma Physics Laboratory

  • Seung Hoe Ku

    • Princeton Plasma Physics Laboratory

  • Choongseok Chang

    • Princeton Plasma Physics Laboratory
    • Princeton Plasma Physics Laboratory, Princeton University

  • Walter Guttenfelder

    • Princeton Plasma Physics Laboratory