Zonal Flows Driven by Small-Scale Drift-Alfven Modes

LI Dehui; ZHOU Deng

Plasma Science and Technology > 2011 > 13(5): 523-527.

LI Dehui, ZHOU Deng. Zonal Flows Driven by Small-Scale Drift-Alfven Modes[J]. Plasma Science and Technology, 2011, 13(5): 523-527.

Citation:

LI Dehui, ZHOU Deng. Zonal Flows Driven by Small-Scale Drift-Alfven Modes[J]. Plasma Science and Technology, 2011, 13(5): 523-527.

Citation:

LI Dehui, ZHOU Deng. Zonal Flows Driven by Small-Scale Drift-Alfven Modes[J]. Plasma Science and Technology, 2011, 13(5): 523-527.

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Zonal Flows Driven by Small-Scale Drift-Alfven Modes

LI Dehui,
ZHOU Deng

1.
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
2.
Center for Magnetic Fusion Theory, Chinese Academy of Sciences, Hefei 230031, China

Funds: This work is supported by National Natural Science Foundation of China (No. 10775137), by the Ministry of Science and Technology of China (No. 2009GB105001) and partly by the JSPS-CAS Core-University Program in the field of Plasma and Nuclear Fusion

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Received Date: July 06, 2010

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Abstract

Abstract

Generation of zonal flows by small-scale drift-Alfven modes is investigated by adopting the approach of parametric instability with the electron polarization drift included. The zonal mode can be excited by primary modes propagating at both electron and ion diamagnetic drift directions in contrast to the assertion in previous study that only primary modes propagating in the ion diamagnetic drift directions can drive zonal instabilities. Generally, the growth rate of the driven zonal mode is in the same order as that in previous study. However, different from the previous work, the growth rate is no longer proportional to the difference between the diamagnetic drift frequencies of electrons and ions.
- zonal flow,
- parametric instability,
- drift-Alfven mode,
- diamagnetic drift

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Zonal Flows Driven by Small-Scale Drift-Alfven Modes

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