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

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 sh...

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Bibliographic Details
Published in:Physical review letters 2007-08, Vol.99 (6), p.065005-065005, Article 065005
Main Authors: Hamada, Y, Watari, T, Yamagishi, O, Nishizawa, A, Narihara, K, Kawasumi, Y, Ido, T, Kojima, M, Toi, K
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CYCLOTRONS
HARMONICS
HEATING
IONS
PLASMA
PLASMA BEAM INJECTION
PLASMA DENSITY
PLASMA DRIFT
SPECTRA
STRONG-COUPLING MODEL
TOKAMAK DEVICES
TRANSMISSION ELECTRON MICROSCOPY
TRAPPED ELECTRONS
WAVE PROPAGATION
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.99.065005