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

doi:10.1103/PhysRevLett.83.2961

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

ENG - Quantum Science and Energy Engineering

Research output: Contribution to journal › Article › peer-review

27 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 language	English
Pages (from-to)	2961-2964
Number of pages	4
Journal	Physical Review Letters
Volume	82
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevLett.83.2961
Publication status	Published - 1999

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10.1103/PhysRevLett.83.2961

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title = "Frequency chirping of core-localized toroidicity-induced alfv{\'e}n eigenmodes and their coupling to global alfv{\'e}n eigenmodes",

abstract = "The fast frequency change or chirping of core-localized toroidicity-induced Alfv{\'e}n 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.",

author = "Kramer, {G. J.} and Cheng, {C. Z.} and Fu, {G. Y.} and Y. Kusama and R. Nazikian and T. Ozeki and K. Tobita",

year = "1999",

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T1 - Frequency chirping of core-localized toroidicity-induced alfvén eigenmodes and their coupling to global alfvén eigenmodes

AU - Kramer, G. J.

AU - Cheng, C. Z.

AU - Fu, G. Y.

AU - Kusama, Y.

AU - Nazikian, R.

AU - Ozeki, T.

AU - Tobita, K.

PY - 1999

Y1 - 1999

N2 - 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.

AB - 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.

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

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