Mode-Coupling Analysis of Parametric Decay Instability in Magnetized Plasmas

YUAN Yuan(袁媛); JIANG Zhonghe(江中和); GUO Weixin(郭伟欣); SUN Xinfeng(孙新锋); HU Xiwei(胡希伟)

doi:10.1088/1009-0630/16/9/01

Plasma Science and Technology > 2014 > 16(9): 809-814. > DOI: 10.1088/1009-0630/16/9/01

YUAN Yuan(袁媛), JIANG Zhonghe(江中和), GUO Weixin(郭伟欣), SUN Xinfeng(孙新锋), HU Xiwei(胡希伟). Mode-Coupling Analysis of Parametric Decay Instability in Magnetized Plasmas[J]. Plasma Science and Technology, 2014, 16(9): 809-814. DOI: 10.1088/1009-0630/16/9/01

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Mode-Coupling Analysis of Parametric Decay Instability in Magnetized Plasmas

State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China

Funds: supported by National Natural Science Foundation of China (Nos. 10990214 and 115450)

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Received Date: May 01, 2013

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Abstract

Abstract

In this paper, derived from Maxwell and fluid equations of plasmas, unified nonlinear wave equations are used to describe the parametric decay instability (PDI) in magnetized plasmas, and in view of mode-coupling, we can obtain all the possible PDI channels. By solving the nonlinear equations with a mode-coupling method, we obtain the growth rate of the PDI, of which all of the three waves are ordinary mode (O-mode) or extraordinary mode (X-mode) wave. Under the dipole approximation, an explicit formula of the growth rate of the X-mode and the condition of the equilibrium density scale are obtained. According to the existence conditions of three X-mode waves, this kind of instability might exist in ECRH with the second harmonic X-mode wave.
- magnetized plasma,
- parametric decay instability,
- mode-coupling theory,
- growth rate

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References (12)

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