Intermittent transport in edge plasma with a 3-D magnetic geometry in the Large Helical Device
Intermittent transport in edge plasma with a 3-D magnetic geometry in the Large Helical Device
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DOI：
10.1016/j.jnucmat.2013.01.117
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发表时间：
2013-07
影响因子：
3.1
通讯作者：
Hirohiko Tanaka;S. Masuzaki;N. Ohno;T. Morisaki;Y. Tsuji
中科院分区：
文献类型：
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作者：
Hirohiko Tanaka;S. Masuzaki;N. Ohno;T. Morisaki;Y. Tsuji
斑点等离子体输运是磁约束装置中普遍观察到的现象，它被认为与边缘等离子体物理密切相关。我们通过使用带有两个电极的快速扫描朗缪尔探针，研究了在大型螺旋装置的偏滤器区域内观察到的这种间歇性事件。离子饱和电流波动显示偏滤器腿中的负尖峰和私人区域中的正尖峰。此外，两次波动之间的时间延迟在正偏度区域遵循独特的轨迹。我们发现 LHD 和托卡马克之间存在共同和不同的波动特征。我们讨论了与偏滤器腿周围的三维磁性几何结构中的斑点生成和传播行为相关的分析结果。此外，我们根据理论假设定量估计了斑点传播速度和大小。
Blobby plasma transport is a universally observed phenomenon in magnetic confinement devices, and it is considered to be closely related to edge plasma physics. We have investigated such an intermittent event observed inside the divertor region of the Large Helical Device by using a fast-scanning Langmuir probe with two electrodes. Ion saturation current fluctuations showed negative spikes in the divertor leg and positive spikes in the private region. Further, the time delay between the two fluctuations followed a unique trajectory in the positive-skewness region. We found common as well as different fluctuation characteristics between the LHD and tokamaks. We discuss the analysis results in relation to the blob-generation and propagation behaviors in the three-dimensional magnetic geometry around the divertor leg. In addition, we quantitatively estimated the blob propagation velocity and size based on a theoretical assumption.