Observation of beta-induced Alfvén eigenmodes in the DIII-D tokamak

W. W. Heidbrink, E. J. Strait, M. S. Chu, A. D. Turnbull

Research output: Contribution to journalArticlepeer-review

185 Citations (Scopus)


Energetic ions can drive Alfvén gap modes unstable, causing large losses of fast ions. Toroidicity-induced Alfvén eigenmodes (TAE) were expected to disappear into the shear Alfvén continuum and become stable as the plasma beta increased. Although TAE modes may disappear, another dangerous instability with similar properties but approximately half the TAE frequency appears in a spectral gap that is created by finite beta effects. The measured frequency of the new mode agrees with the theoretical frequency of beta-induced Alfvén eigenmodes.

Original languageEnglish
Pages (from-to)855-858
Number of pages4
JournalPhysical review letters
Issue number6
Publication statusPublished - 1993

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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