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首页> 外文期刊>Plasma physics and controlled fusion >Observation of coherent bicoherence and biphase in potential fluctuations around geodesic acoustic mode frequency on JFT-2M
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Observation of coherent bicoherence and biphase in potential fluctuations around geodesic acoustic mode frequency on JFT-2M

机译：在JFT-2M上测地声模频率周围的潜在波动中的相干双相干和双相的观测

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Two types of small-poloidal wavelength low frequency floating potential fluctuations (similar to 1 kHz, and 10-15 kHz) are observed in the edge region of ohmically heated plasmas in the JFT-2M tokamak. The higher frequency fluctuations are inferred as geodesic acoustic modes (GAMs). Significant bicoherences between both modes and the broad-band fluctuations are observed simultaneously; however, frequency ranges are different. A significant bicoherence range is from 70 to 125 kHz at the lower frequency modes (LFM) and is from 20 to 125 kHz at the GAM. Phase angles at the significant bicoherences are coherent around pi. These results indicate that both modes are nonlinearly coupled to the broad-band fluctuations. Two spectral peaks are observed around the GAM frequency and the difference in peak frequencies is around the LFM frequency, suggesting nonlinear couplings between the LFM and the GAM. However, the modulation of the GAM by the LFM is not conclusive. In this paper, the results of the letter (Nagashima et al 2005 Phys. Rev. Lett. 95 095002) are presented in detail.
机译：在JFT-2M托卡马克的欧姆加热等离子体的边缘区域中观察到两种类型的小极化波波长低频浮动电势波动（类似于1 kHz和10-15 kHz）。较高的频率波动被推断为测地声模（GAM）。同时观察到两种模式之间的显着双相干性以及宽带波动。但是，频率范围是不同的。在较低的频率模式（LFM）下，有效的双相干范围是70至125 kHz，而在GAM处则是20至125 kHz。显着双相干处的相位角在pi附近相干。这些结果表明，两种模式都非线性耦合到宽带波动。在GAM频率附近观察到两个频谱峰值，峰值频率的差异在LFM频率附近，这表明LFM与GAM之间存在非线性耦合。但是，LFM对GAM的调制不是决定性的。在本文中，详细介绍了这封信的结果（Nagashima等人，2005，Phys。Rev. Lett。95 095002）。

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