Skip to main content
eScholarship
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.
Abstract

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.

Many UC-authored scholarly publications are freely available on this site because of the UC Academic Senate's Open Access Policy. Let us know how this access is important for you.

Main Content
Current View