Frequency chirping of core-localized toroidicity-induced alfvén eigenmodes and their coupling to global alfvén eigenmodes

G. J. Kramer, C. Z. Cheng, G. Y. Fu, Y. Kusama, R. Nazikian, T. Ozeki, K. Tobita

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The fast frequency change or chirping of core-localized toroidicity-induced Alfvén eigenmodes (C-TAE), excited before giant sawteeth during ion cyclotron resonance heating, has been investigated. The chirping can be accounted for by small changes of the central q profile. When the C-TAE crosses the frequency of a global TAE (G-TAE) a small frequency gap was found. These gaps can be attributed to mode coupling between the C-TAE and a G-TAE which is observed for the first time. The coupling and the frequency gaps are consistent with linear TAE mode coupling.

Original languageEnglish
Pages (from-to)2961-2964
Number of pages4
JournalPhysical review letters
Volume82
Issue number15
DOIs
Publication statusPublished - 1999 Jan 1

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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