Numerical modeling of edge-localized-mode filaments on divertor plates based on thermoelectric currents.
Numerical modeling of edge-localized-mode filaments on divertor plates based on thermoelectric currents.
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DOI：
10.1103/physrevlett.104.175001
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发表时间：
2010-04
影响因子：
8.6
通讯作者：
A. Wingen;T. Evans;C. Lasnier;K. Spatschek
中科院分区：
文献类型：
--
作者：
A. Wingen;T. Evans;C. Lasnier;K. Spatschek
利用边缘局域模碰撞过程中在擦除层（SOL）中观测到的电流脉冲，对托卡马克装置中的边缘局域模（ELM）进行了定性和定量的模拟。在ELM的初始阶段，热脉冲引起热电流。它们首先在短连接长度的通量管中流动，该通量管最初由误差场或其他非轴对称磁扰动建立。电流以这样的方式改变磁场拓扑，使得出现更大面积的短连接长度通量管。然后，电流主要在短的SOL状通量管中流动，并且假设恒定的电流密度与通量管的面积成比例。对于给定电流的通量管模式的定量预测与在ELM循环期间在DIII-D靶板处的热负荷和电流的测量非常一致。
Edge localized modes (ELMs) are qualitatively and quantitatively modeled in tokamaks using current bursts which have been observed in the scrape-off-layer (SOL) during an ELM crash. During the initial phase of an ELM, a heat pulse causes thermoelectric currents. They first flow in short connection length flux tubes which are initially established by error fields or other nonaxisymmetric magnetic perturbations. The currents change the magnetic field topology in such a way that larger areas of short connection length flux tubes emerge. Then currents predominantly flow in short SOL-like flux tubes and scale with the area of the flux tube assuming a constant current density. Quantitative predictions of flux tube patterns for a given current are in excellent agreement with measurements of the heat load and current flow at the DIII-D target plates during an ELM cycle.