Contribution of geodesic acoustic modes in the limit cycle oscillation near H-mode transition in JFT-2M plasmas

K. Itoh, T. Kobayashi, T. Ido, Sanae Itoh, K. Kamiya

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The magnitude of geodesic acoustic modes (GAMs) is analyzed, which are driven by the oscillating Reynolds stress force in poloidal direction in the limit cycle oscillation (LCO) of tokamaks near the condition of H-mode transition. Although the frequency of LCO is much lower than the natural frequency, the forced oscillation of GAMs at the LCO frequency is excited. The amplitude of excited GAMs can be similar to that of low frequency zonal flows. The result is compared with the observation of the JFT-2M tokamak.

Original languageEnglish
Article number092001
JournalPlasma Physics and Controlled Fusion
Volume57
Issue number9
DOIs
Publication statusPublished - Jul 30 2015

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Natural frequencies
Plasmas
oscillations
cycles
acoustics
forced vibration
Reynolds stress
resonant frequencies
low frequencies

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Contribution of geodesic acoustic modes in the limit cycle oscillation near H-mode transition in JFT-2M plasmas. / Itoh, K.; Kobayashi, T.; Ido, T.; Itoh, Sanae; Kamiya, K.

In: Plasma Physics and Controlled Fusion, Vol. 57, No. 9, 092001, 30.07.2015.

Research output: Contribution to journalArticle

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