An Asymptotic Method for the Vlasov Equation III : Transition from Amplitude Oscillation to Linear Landau Damping
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概要
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A numerical investigation of nonlinear behaviours of the Landau damping is achieved. The basic equations cover the amplitude oscillation, the linear Landau damping, and intermediate regions on wave behaviours. We find that a plateau is formed in a temporal profile of amplitude of an electric field D for q<<1 but also for q≲0.5 the plateau seems to be constructed, where q≡γ_L/ω_B, γ_L being the linear Landau damping coefficient and ω_B the bouncing frequency of trapped electrons in a potential trough of a wave. Another kind of plateau appears for q≈0.77 and for q<0.77 the wave damps out (not necessarily Landau-damped). Time evolution of the number of "trapped" electrons and of distributions of resonant electrons are shown. It is found that even if D is almost saturated when q<<1 the corresponding distribution is not necessarily seen to be flat.
- 核融合科学研究所の論文
著者
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KAMIMURA Tetsuo
Research Information Center, Institute of Plasma Physics, Nagoya University
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Kamimura Tetsuo
Research Information Center Institute Of Plasma Physics Nagoya University
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Sugihara Ryo
Research Information Center Institute Of Plasma Physics Nagoya University
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