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

E. M. Carolipio, W. W. Heidbrink, C. Z. Cheng, M. S. Chu, G. Y. Fu, A. Jaun, D. A. Spong, A. D. Turnbull, R. B. White

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)3391-3401
Number of pages11
JournalPhysics of Plasmas
Volume8
Issue number7
DOIs
Publication statusPublished - 2001 Jul

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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