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Open Access Publications from the University of California

An Alfvén eigenmode similarity experiment

  • Author(s): Heidbrink, WW
  • Fredrickson, E
  • Gorelenkov, NN
  • Hyatt, AW
  • Kramer, G
  • Luo, Y
  • et al.

The major radius dependence of Alfvén mode stability is studied by creating plasmas with similar minor radius, shape, magnetic field (0.5 T), density (ne≃ 3 × 1019m-3), electron temperature (1.0 keV) and beam ion population (near-tangential 80 keV deuterium injection) on both NSTX and DIII-D. The major radius of NSTX is half the major radius of DIII-D. The super-Alfvénic beam ions that drive the modes have overlapping values of vf/vAin the two devices. Observed beam-driven instabilities include toroidicity-induced Alfvén eigenmodes (TAE). The stability threshold for the TAE is similar in the two devices. As expected theoretically, the most unstable toroidal mode number n is larger in DIII-D.

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