Pressure Driven MHD Instabilities Observed in Neutral Beam Heated Plasmas of the Large Helical Device
Pressure Driven MHD Instabilities Observed in Neutral Beam Heated Plasmas of the Large Helical Device
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大型螺旋装置中性束加热等离子体中观察到的压力驱动 MHD 不稳定性
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
Watanabe Kiyomasal
中科院分区：
文献类型：
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作者：
Takechi Manabu;Watanabe Kiyomasal
用磁探针在大螺旋装置中性束加热等离子体中观察到两种低频（<10 kHz）磁流体动力学（MHD）不稳定性。其中m = 3| n = 3模结构，频率随体等离子体β值的增加而增加，并趋于饱和，产生二次和三次谐波，当体等离子体β值超过阈值（-0.3Vo），等离子体电流达到一定水平时，似乎激发出异频=2/n= 1模。软X射线起伏的径向结构表明，前一个模式被激发的边缘附近。前者被认为是在l/q = 1表面周围的等离子体边缘区激发的电阻交换模，后者被认为是在l/q = 0.5表面周围的等离子体核心区激发的理想交换模。
Two types of low frequency (< l0 kHz) magnetohydrodynamic (MHD) instabilities are observed with the magnetic probes in neutral beam heated plasmas of the Large Helical Device (LHD). One has m = 3 | n = 3 mode structure and the frequency increases with the increase in the bulk plasma beta and tendstosaturate.Thismodegeneratesthesecondandthirdharmonics.Theotherism=2/n=lmode and seems to be excited when the plasma beta value exceed the threshold (- 0.3 Vo) and the plasma current reaches a certain level. The radial structure of soft X-ray fluctuations suggests that the former mode is excited near the edge. The former mode is considered to be the resistive interchange mode excited in the plasma edge region around the l/q = I surface and the latter is the ideal interchange mode excited in the plasma core region around the l/q = 0.5 surface.