Understanding the turbulent mechanisms setting the density decay length in the tokamak scrape-off layer
Understanding the turbulent mechanisms setting the density decay length in the tokamak scrape-off layer
复制标题
了解设定托卡马克刮落层密度衰减长度的湍流机制
DOI：
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发表时间：
2020
影响因子：
2.5
通讯作者：
P. Ricci
中科院分区：
文献类型：
--
作者：
C. Beadle;P. Ricci
在托卡马克等离子体的外中平面的刮削层（SOL）的密度衰减的机制设置解开使用双零磁位形和分析估计的双流体数值模拟。典型的实验观察检索，特别是增加的湍流从近到远SOL，这是反映在两个不同的密度衰减长度的不稳定性。近SOL的衰减长度被很好地描述为由非线性饱和气球不稳定性驱动的运输的结果，而在远SOL中，密度衰减长度使用由斑点介导的间歇性运输的模型来描述。衰变长度的解析估计值与模拟结果和典型实验值吻合较好，可用于指导托卡马克的设计和运行。
Mechanisms setting the density decay in the scrape-off layer (SOL) at the outer midplane of a tokamak plasma are disentangled using two-fluid numerical simulations in a double-null magnetic configuration and analytical estimates. Typical experimental observations are retrieved, in particular increasing intermittency of the turbulence going from the near to the far SOL, which is reflected in two different density decay lengths. The decay length of the near SOL is well described as the result of transport driven by a nonlinearly saturated ballooning instability, while in the far SOL, the density decay length is described using a model of intermittent transport mediated by blobs. The analytical estimates of the decay lengths agree well with the simulation results and typical experimental values and can therefore be used to guide tokamak design and operation.
影响因子：
6.3
作者：
Dudson, B. D.;Umansky, M. V.;Wilson, H. R.
通讯作者：
Wilson, H. R.