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Large-scale structures and turbulence saturation in gyrofluid ETG simulations

Published online by Cambridge University Press:  20 December 2006

JIQUAN LI ,
Y. KISHIMOTO ,
N. MIYATO ,
T. MATSUMOTO  and
J. Q. DONG
JIQUAN LI
Affiliation:
Southwestern Institute of Physics, P.O. Box 432, Chengdu, Sichuan 610041, China SWIP-DUT Joint Lab for Fusion Plasma Physics, Chengdu, China (lijq@energy.kyoto-u.ac.jp) Permanent address: Department of Fundamental Energy, Kyoto University, Gokasho, Uji 611-0011, Japan.
Y. KISHIMOTO
Affiliation:
Department of Fundamental Energy, Kyoto University, Gokasho, Uji 611-0011, Japan Naka Fusion Research Establishment, JAERI, Naka, Ibaraki 311-0193, Japan
N. MIYATO
Affiliation:
Naka Fusion Research Establishment, JAERI, Naka, Ibaraki 311-0193, Japan
T. MATSUMOTO
Affiliation:
Naka Fusion Research Establishment, JAERI, Naka, Ibaraki 311-0193, Japan
J. Q. DONG
Affiliation:
Southwestern Institute of Physics, P.O. Box 432, Chengdu, Sichuan 610041, China SWIP-DUT Joint Lab for Fusion Plasma Physics, Chengdu, China (lijq@energy.kyoto-u.ac.jp)
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Abstract

The dynamics of secondary fluctuations with poloidal long wavelength and low frequency in electron-temperature-gradient (ETG) turbulence saturation is considered in sheared slab geometry. A simplified modeling analysis shows that this kind of large-scale structure including streamers may saturate primary ETG instability through poloidal mode coupling. Spectral analyses in three-dimensional ETG simulations clearly exhibit the secondary excitation and the probable relevancy to ETG saturation. The result may implicate a lower fluctuation level in ETG turbulence.

Type
Papers
Information
Journal of Plasma Physics , Volume 72 , Issue 6 , December 2006 , pp. 1173 - 1177
Copyright
2006 Cambridge University Press

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