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Beam ion driven instabilities in the national spherical tokamak experiment

  • Author(s): Gorelenkov, NN
  • Belova, E
  • Berk, HL
  • Cheng, CZ
  • Fredrickson, E
  • Heidbrink, WW
  • Kaye, S
  • Kramer, GJ
  • et al.

Published Web Location

https://doi.org/10.1063/1.1689667Creative Commons Attribution 4.0 International Public License
Abstract

Low and high frequency beam ion driven instabilities in the National Spherical Tokamak Experiment (NSTX) plasma were analyzed. Low frequency magnetohydrodynamics (MHD) activities in ∼100 kHz frequency range on NSTX were often observed and identified as the TAEs driven by beam ions. It was shown that there was a large uncertainty in the experimental plasma parameters upon which the numerical model was based for the low-n TAE instabilities. The analysis helps to validate the NOVA/NOVA-K predictions that TAEs will be unstable in ITER if driven by fusion alphas in a plasma with Ti0>20 KeV.

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