Understanding the SOL flow in L-mode plasma on divertor tokamaks, and its influence on the plasma transport
Understanding the SOL flow in L-mode plasma on divertor tokamaks, and its influence on the plasma transport
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DOI：
10.1016/j.jnucmat.2006.12.029
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发表时间：
2007-06
影响因子：
3.1
通讯作者：
N. Asakura
中科院分区：
文献类型：
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作者：
N. Asakura
在理解 SOL 沿磁场线质量传输（SOL 流）的驱动机制方面取得了重大进展。通过马赫探针和杂质羽流进行的 SOL 流量测量已在偏滤器托卡马克的不同极向位置的 L 模式等离子体中进行。所有结果都显示出常见的 SOL 流动模式：从低场侧 (LFS) SOL 到高场侧 (HFS) 偏滤器产生平行马赫数 (M∥) 为 0.2-1 的亚音速流，用于离子 ∇B 向偏滤器漂移。 SOL 流型主要是由 LFS 增强的扩散不对称性和经典漂移形成的。此外，偏滤器分离和/或强烈的抽吸和泵送增强了 HFS SOL 流量。大多数代码都包含漂移效应，并且对不对称扩散进行建模以模拟快速 SOL 流动。在实验中直接观察到快速 SOL 流对 SOL 中杂质流、核心等离子体屏蔽和沉积剖面的影响。
Significant progress has been made in understanding the driving mechanisms in SOL mass transport along the magnetic field lines (SOL flow). SOL flow measurements by Mach probes and impurity plume have been performed in L-mode plasma at various poloidal locations in divertor tokamaks. All results showed common SOL flow patterns: subsonic flow with parallel Mach number (M∥) of 0.2–1 was generated from the Low-Field-Side (LFS) SOL to the High-Field-Side (HFS) divertor for the ion ∇B drift towards the divertor. The SOL flow pattern was formed mainly by LFS-enhanced asymmetry in diffusion and by classical drifts. In addition, divertor detachment and/or intense puffing-and-pump enhanced the HFS SOL flow. Most codes have incorporated drift effects, and asymmetric diffusion was modelled to simulate the fast SOL flow. Influences of the fast SOL flow on the impurity flow in the SOL, shielding from core plasma, and deposition profile, were directly observed in experiments.