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首页> 外文期刊>Plasma and Fusion Research >Observation of Density Fluctuations Originated from RF Waves with Two-Channel Reflectometer in GAMMA 10/PDX
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Observation of Density Fluctuations Originated from RF Waves with Two-Channel Reflectometer in GAMMA 10/PDX

机译：在GAMMA 10 / PDX中使用两通道反射仪观测源自RF波的密度波动

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Slow Alfvén wave with a frequency just below an ion cyclotron frequency can be destabilized by the anisotropy of ion temperature and called as Alfvén-Ion-Cyclotron (AIC) wave. In the GAMMA 10/PDX central cell, several AIC waves simultaneously appear in an unstable frequency range. In addition, low-frequency waves with the difference frequencies (DF) between the AIC waves are observed, and their characteristics have to be clarified to reveal their unknown contributions to the ion transport suggested in GAMMA 10/PDX. In this study, simultaneous two-point measurements in the azimuthal and axial directions were conducted by using a two-channel microwave reflectometer with multi horn antennas. The azimuthal mode number ( m ) of the DF waves was confirmed at inner plasma region for the first time, and was zero, which satisfies azimuthal mode matching with the m = ?1 AIC waves. In addition, it was shown that the DF waves were radially localized in an inner region, which is different from rather broad profiles of the AIC waves.
机译：频率低于离子回旋加速器频率的慢Alfvén波可以通过离子温度的各向异性而不稳定，被称为Alfvén-离子回旋加速器（AIC）波。在GAMMA 10 / PDX中央单元中，几个AIC波同时出现在不稳定的频率范围内。此外，还观察到了在AIC波之间具有不同频率（DF）的低频波，必须澄清它们的特性以揭示它们对GAMMA 10 / PDX中建议的离子传输的未知贡献。在这项研究中，通过使用带有多号角天线的两通道微波反射仪在方位角和轴向同时进行两点测量。 DF波的方位模数（m）首次在内部等离子体区域得到确认，并且为零，满足与m =？1 AIC波匹配的方位模。另外，已经表明，DF波径向地位于内部区域，这与AIC波的相当宽的轮廓不同。

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