The divertor plasma characteristics in the Large Helical Device
The divertor plasma characteristics in the Large Helical Device
复制标题
大型螺旋装置中偏滤器等离子体特性
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
O. Motojima
中科院分区：
文献类型：
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作者：
S. Masuzaki;T. Morisaki;N. Ohyabu;A. Komori;H. Suzuki;N. Noda;Y. Kubota;R. Sakamoto;K. Narihara;K. Kawahata;K. Tanaka;T. Tokuzawa;S. Morita;M. Goto;M. Osakabe;Tsuguhiro Watanabe;Yutaka Matsumoto;O. Motojima
本文主要利用朗缪尔探针研究了大螺旋装置（LHD）中分流器的等离子体特性。螺旋导流器的三维结构是在日光型磁结构中自然产生的，在导流板上测量的颗粒和功率沉积剖面中可以清楚地看到。这些观测结果与场线追踪的数值结果一致。导流板的粒子通量几乎随线平均密度线性增加。在托卡马克中观察到的高再循环状态和分流器脱离，即使在低输入功率的高密度放电中也没有观察到。在开放场线的随机层中，电子密度和温度随半径的增大而减小，在导流板处，电子密度和温度比最后一个封闭通量面低得多。这意味着沿磁力线的压力降低发生在LHD的开路磁力线区域。
Divertor plasma characteristics in the Large Helical Device (LHD) have been investigated mainly by using Langmuir probes. The three-dimensional structure of the helical divertor, which is naturally produced in the heliotron-type magnetic configuration, is clearly seen in the measured particle and power deposition profiles on the divertor plates. These observations are consistent with the numerical results of field line tracing. The particle flux to the divertor plates increases almost linearly with the line averaged density. The high-recycling regime and divertor detachment, which are observed in tokamaks, have not been observed even during high density discharges with low input power. Both electron density and temperature decrease with increasing radius in the stochastic layer with open field lines, and at the divertor plate they become fairly low compared with those at the last closed flux surface. This means the reduction of pressure along the magnetic field lines occurs in the open field line region in LHD.