Beam ion driven instabilities in the national spherical tokamak experiment

N. N. Gorelenkov, E. Belova, H. L. Berk, C. Z. Cheng, E. Fredrickson, W. W. Heidbrink, S. Kaye, G. J. Kramer

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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 T i0>20 KeV.

Original languageEnglish
Pages (from-to)2586-2593
Number of pages8
JournalPhysics of Plasmas
Volume11
Issue number5 PART 2
DOIs
Publication statusPublished - 2004 May 1

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Gorelenkov, N. N., Belova, E., Berk, H. L., Cheng, C. Z., Fredrickson, E., Heidbrink, W. W., Kaye, S., & Kramer, G. J. (2004). Beam ion driven instabilities in the national spherical tokamak experiment. Physics of Plasmas, 11(5 PART 2), 2586-2593. https://doi.org/10.1063/1.1689667