Change of zonal flow spectra in the JIPP T-IIU tokamak plasmas

Y. Hamada, T. Watari, O. Yamagishi, A. Nishizawa, K. Narihara, Y. Kawasumi, T. Ido, M. Kojima, K. Toi

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Abstract

When Ohmically heated low-density plasmas are additionally heated by higher-harmonics ion-cyclotron-range-of frequency heating, heated by neutral beam injection, or strongly gas puffed, the intensity of zonal flows in the geodesic acoustic mode frequency range in the tokamak core plasma decreases sharply and that of low-frequency zonal flow grows drastically. This is accompanied by a damping of the drift wave propagating in the electron diamagnetic drift direction, turbulence by trapped electron mode (TEM), and the increase of the mode propagating to ion diamagnetic drift direction (ITG). In the half-radius region, TEM and high-frequency zonal flows remain intense in both OH and heated phases. ITG and low-frequency zonal flows grow in heated plasmas, suggesting a strong coupling between ITG and low-frequency zonal flow.

Original languageEnglish
Article number065005
JournalPhysical Review Letters
Volume99
Issue number6
DOIs
Publication statusPublished - Aug 10 2007
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Hamada, Y., Watari, T., Yamagishi, O., Nishizawa, A., Narihara, K., Kawasumi, Y., ... Toi, K. (2007). Change of zonal flow spectra in the JIPP T-IIU tokamak plasmas. Physical Review Letters, 99(6), [065005]. https://doi.org/10.1103/PhysRevLett.99.065005