Second-order toroidicity-induced Alfvén eigenmodes and mode splitting in a low-aspect-ratio tokamak

A. D. Turnbull, Ming-Sheng Chu, M. S. Chance, J. M. Greene, L. L. Lao, E. J. Strait

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

A variational ideal magnetohydrodynamic stability code is used to compute the toroidicity-induced Alfvén eigenmode (TAE) for toroidal mode number n = 1 in full toroidal geometry with circular cross section. At finite aspect ratio, toroidicity also couples poloidal mode numbers m with m+ 2 to produce a higher frequency gap in the shear Alfvén spectrum, which is associated with a new, second-order TAE mode. It is also found that toroidal coupling between the TAE modes and continuum branches induces splitting of the TAE modes into two or more global modes at slightly different frequencies. Both the new modes and splitting of the TAE modes have important consequences for the identification of TAE modes in experiments.

Original languageEnglish
Pages (from-to)3451-3453
Number of pages3
JournalPhysics of Fluids B
Volume4
Issue number10
DOIs
Publication statusPublished - 1992 Jan 1

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

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