The fine structure of ELMs in the scrape-off layer
The fine structure of ELMs in the scrape-off layer
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DOI：
10.1088/0741-3335/47/2/002
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发表时间：
2005-02
影响因子：
2.2
通讯作者：
M. Endler;I. García-Cortés;C. Hidalgo;G F Matthews;ASDEX-Upgrade team;Jet-Efda Team
中科院分区：
文献类型：
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作者：
M. Endler;I. García-Cortés;C. Hidalgo;G F Matthews;ASDEX-Upgrade team;Jet-Efda Team
在ASDEX和JET托卡马克装置上，利用具有高时空分辨率的诊断系统观测到了边缘局域模。在ELM过程中，子结构存在于刮除层（SOL）中，尺寸为2-5 cm，寿命为20-50 µs。直接观测了它们的极轴-时间演化，并估算了这些子结构中由于湍流E × B漂移引起的径向输运。ELMs和这些子结构的极向尺寸和速度和相关的径向运输之间的“正常”波动的比较。在ELMs的径向运输增加，主要是由于这些子结构。所观察到的波动幅度和速度的子结构被发现是兼容的径向运输等离子体的“斑点”和鞘边界条件产生的等离子体电位梯度的模型。由于湍流径向E × B流的传输进行了比较，在ELM期间和ELM之间，并在主等离子体SOL中的ELM子结构的观察与靶板上的子结构的观察放在上下文中。
Edge-localized modes (ELMs) have been observed by diagnostic systems with high spatial and temporal resolution in the ASDEX and JET tokamaks. During the ELMs, substructures exist in the scrape-off layer (SOL) with sizes of 2–5 cm and lifetimes of the order of 20–50 µs. Their poloidal–temporal evolution is directly observed, and the radial transport due to turbulent E × B drift in these substructures is estimated. A comparison is made between ‘normal’ fluctuations between ELMs and these substructures in terms of poloidal size and velocity and related radial transport. The increased radial transport during ELMs is shown to be mainly due to these substructures. The observed fluctuation amplitudes and velocities of the substructures are found to be compatible with the model of radial transport by plasma ‘blobs’ and plasma potential gradients generated by the sheath boundary conditions. The transport due to turbulent radial E × B flows is compared during and between ELMs, and the observation of ELM substructures in the main plasma SOL is put into context with the observation of substructures on the target plates.