Investigating the relationship between the radial electric field and neutral beam injected energetic particles in LHD

ORAL

Abstract

Understanding energetic particle (EP) transport is crucial for optimizing stellarator performance and enhancing fusion efficiency. In this research, we utilize the gyrokinetic toroidal code (GTC) to perform neoclassical simulations of EP transport in the Large Helical Device (LHD) to investigate the relationship between the ambipolar radial electric field (Er) and neutral beam injected (NBI) EP dynamics. To capture the realistic behavior of EPs, we use as input the slowing-down distribution function of fast ions obtained from GNET simulations. A positive Er is found to reinforce the poloidal precession velocity of trapped particles, reducing radial transport and improving confinement. The Er calculated from the ambipolar fluxes of ions and electrons in GTC is compared with experimental data.

*This work has been partially supported by grants from the DOE SciDAC, HiFiStell, and INCITE projects.

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Publication: Planned Paper: Energetic particle transport under the effects of the radial electric field in LHD

Presenters

  • Ethan Maxwell Green

    • University of California, Irvine

Authors

  • Ethan Maxwell Green

    • University of California, Irvine

  • Wataru Hokulea Jason Hayashi

    • University of California, Irvine

  • Haotian Chen

    • University of California, Irvine

  • Masaki Osakabe

    • National Institute for Fusion Science

  • Hiroyuki Yamaguchi

    • National Institute for Fusion Science

  • Masaki Nishiura

    • National Institute for Fusion Science

  • Kunihiro Ogawa

    • National Institute for Fusion Science

  • Abhiyan Paudel

    • Rensselaer Polytechnic Institute

  • Jacob Merson

    • Rensselaer Polytechnic Institute

  • Ryohsuke Seki

    • National Institute for Fusion Science

  • hideo nuga

    • National Institute for Fusion Science

  • William Walter Heidbrink

    • University of California, Irvine

  • Zhihong Lin

    • University of California, Irvine