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The toroidicity-induced Alfvén eigenmode structure in DIII-D: Implications of soft x-ray and beam-ion loss data

  • Author(s): Carolipio, EM
  • Heidbrink, WW
  • Cheng, CZ
  • Chu, MS
  • Fu, GY
  • Jaun, A
  • Spong, DA
  • Turnbull, AD
  • White, RB
  • et al.

Published Web Location

https://doi.org/10.1063/1.1378066Creative Commons Attribution 4.0 International Public License
Abstract

The internal structure of the toroidicity-induced Alfvén eigenmode (TAE) is studied by comparing soft x-ray profile and beam ion loss data taken during TAE activity in the DIII-D tokamak [W. W. Heidbrink et al., Nucl. Fusion 37, 1411 (1997)] with predictions from theories based on ideal magnetohydrodynamic (MHD), gyrofluid, and gyrokinetic models. The soft x-ray measurements indicate a centrally peaked eigenfunction, a feature which is closest to the gyrokinetic model's prediction. The beam ion losses are simulated using a guiding center code. In the simulations, the TAE eigenfunction calculated using the ideal MHD model acts as a perturbation to the equilibrium field. The predicted beam ion losses are an order of magnitude less than the observed ∼6%-8% losses at the peak experimental amplitude of δBr/B0≃2-5×10-4. © 2001 American Institute of Physics.

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