On the magnitude and distribution of halo currents during disruptions on MAST
On the magnitude and distribution of halo currents during disruptions on MAST
复制标题
关于 MAST 中断期间晕流的大小和分布
DOI：
10.1088/0741-3335/49/4/007
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发表时间：
2007
影响因子：
2.2
通讯作者：
D. Taylor
中科院分区：
文献类型：
--
作者：
G. Counsell;R. Martín;T. Pinfold;D. Taylor
监测所有晕电流路径的MAST最近的结果表明，在中断期间，负责产生晕电流的等离子体更多地充当电压源而不是电流源。因此，晕电流必须沿其流动的电流路径的电阻对电流的大小有深远的影响。这可能会为将电流从ITER等未来设备中的敏感部件转移开提供机会。对3800多次中断的数据分析表明，桅杆上的晕电流是相对良性的，峰值不到中断前等离子体电流的25%，在中柱附近的分布相当对称(平均环状峰值因子∼1.1)。较低的峰值系数有利于减小中柱区域的倾斜/弯曲力，该区域用于大型支撑的空间有限。
Recent results from MAST in which all halo current paths are monitored suggest that, during disruptions, the plasma responsible for the generation of halo current acts more as a voltage source than a current source. As a result the resistance of the current path along which the halo current must flow has a profound impact on the magnitude of the current. This may provide opportunities for directing the current away from sensitive components in future devices such as ITER. Analysis of data from over 3800 disruptions shows that the halo currents on MAST are relatively benign, having a peak value less than 25% of the pre-disruption plasma current with a rather symmetric distribution near the centre column (average toroidal peaking factor ∼1.1). The low peaking factor favourably reduces the tilting/bending forces in the region of the centre column, which has limited space for bulky supports.