Measurements of non-axisymmetric effects in the DIII-D divertor
Measurements of non-axisymmetric effects in the DIII-D divertor
复制标题
DIII-D 偏滤器中非轴对称效应的测量
DOI：
10.1016/0022-3115(94)00419-6
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
M. Schaffer
中科院分区：
文献类型：
--
作者：
T. Evans;C. Lasnier;D. Hill;A. Leonard;M. Fenstermacher;T. Petrie;M. Schaffer
在DIII-D偏滤器热通量和刮削层（SOL）电流中观察到非稳态环形不对称。使用当前的DIII-D诊断，在单零H模式（< 5%）中看到的不对称性比在双零H模式（> 50%）中看到的不对称性少得多。转向器热通量不对称的特征在于径向轮廓的环形变化（即，多个或分叉的峰），而在其它环形位置处为单峰，而SOL电流有时具有强双极环形结构。SOL电流不对称性在边缘局部模式（ELM）期间特别大。这里报道的测量结果表明，最好的非轴对称径向磁扰动的模型中创建的等离子体边界和SOL，然后导致偏滤器的热通量和SOL电流的环形变化的磁岛描述的不对称性。
Non-stationary toroidal asymmetries are observed in the DIII-D divertor heat flux and scrape-off layer (SOL) currents. Using the present DIII-D diagnostics, asymmetries are seen much less frequently in single-null H-modes (< 5%) than in double-null H-modes (> 50%). Divertor heat flux asymmetries are characterized by toroidal variations in the radial profile (i.e., multiple or bifurcated peaks) at some toroidal locations and single peaks at other toroidal locations while SOL currents sometimes have a strongly bipolar toroidal structure. SOL current asymmetries are particularly large during Edge Localized Modes (ELMs). The measurements reported here indicate that the asymmetries are best described by a model in which non-axisymmetric radial magnetic perturbations create magnetic islands in the plasma boundary and SOL which then cause toroidal variation in the divertor heat flux and the SOL currents.