<RESEARCH REPORT>COMPUTER SIMULATIONS ON THE NONLINEAR FREQUENCY SHIFT AND NONLINEAR MODULATION OF ION-ACOUSTIC WAVES
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概要
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The nonlinear behavior of ion-acoustic waves with rather short wave-length, κλ_<De>≈l, is investigated by computer sumulations. It is observed that the nonlinear frequency shift is negative and is proportional to square root of the initial wave amplitude when the amplitude is not too large. This proportionality breaks down and the frequency shift can become positive (for large Te/Ti), when (n^^∿_i/n_0)^<1/2>>0.25,where n^^∿_i is the ion density perturbation and n_0 the average plasma density. Nonlinear modulation of the wave-packet is clearly seen; however, modulational instability was not observed. The importance of the effects of trapped ions to these phenomena is emphasized.
- 核融合科学研究所の論文
著者
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Ohsawa Yukiharu
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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