Measurement of Ion Cyclotron Emissions by Using High-Frequency Magnetic Probes in the LHD
Measurement of Ion Cyclotron Emissions by Using High-Frequency Magnetic Probes in the LHD
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DOI：
10.1088/1009-0630/15/3/03
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发表时间：
2013-03-01
影响因子：
1.7
通讯作者：
Mutoh, Takashi
中科院分区：
文献类型：
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作者：
Saito, Kenji;Kumazawa, Ryuhei;Mutoh, Takashi
在大型螺旋装置(LHD)中安装了两对高频磁性探头。在垂直中性束注入过程中，探测到基频对应于等离子体边缘离子回旋频率的离子回旋发射(ICE)，这与以前的备用离子回旋频率范围(ICRF)加热天线测量的ICE类型相同。关于信号的相位和强度，进一步研究了这种类型的ICE。在LHD中发现了另一种类型的冰，这些冰与由Alfven本征模(TAE)引起的环面爆发和丢失离子通量强度的增加同步。因此，这些冰的来源被认为是由TAE爆发从等离子体核心转移到等离子体外部的粒子。由于离子回旋频率随磁场强度的增加而增加，因此由TAE爆发引起的冰的频率随着磁场强度的增加而线性增加。
Two pairs of high-frequency magnetic probes were installed in the Large Helical Device (LHD). During the injection of a perpendicular neutral beam, ion cyclotron emissions (ICEs) with the fundamental frequency corresponding to the ion cyclotron frequency at the plasma edge were detected, which are the same type of ICE as measured with the former spare ion cyclotron range of frequencies (ICRF) heating antennas. This type of ICE was further investigated with regard to the phase and intensity of signals. Another type of ICE was found in the LHD, and these ICEs were synchronized with bursts of toroidicity induced Alfven eigenmodes (TAE) and the rise of intensity of lost ion flux. Therefore the source of these ICEs was thought to be the particles transferred from the core to the outer region of plasma by the TAE bursts. The frequency of ICEs induced by the TAE bursts increases linearly with the magnetic field strength, since the ion cyclotron frequency increases with the magnetic field strength.