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On the magnitude and distribution of halo currents during disruptions on MAST

G F Counsell, R Martin, T Pinfold, D Taylor, the MAST team2007年Plasma Physics and Controlled FusionIF 2.2出版社

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.

日本語訳

MASTにおける全ハロー電流経路を監視した最近の結果は、ディスラプション中にハロー電流の生成に関与するプラズマが、電流源というよりも電圧源としてより強く作用することを示唆している。その結果、ハロー電流が流れなければならない電流経路の抵抗は、電流の大きさに大きな影響を与える。これは、ITERのような将来の装置において、敏感な構成要素から電流を遠ざける機会を提供する可能性がある。3800回以上のディスラプションのデータ解析により、MASTにおけるハロー電流は比較的穏やかであり、そのピーク値はディスラプション前のプラズマ電流の25%未満で、中心柱付近ではかなり対称的な分布を示す(平均トロイダル増倍係数は約1.1)。この低い増倍係数は、かさばる支持構造のためのスペースが限られている中心柱領域における傾斜/曲げ力を低減するのに有利に働く。

装置

mast高精度(タイトル一致)iter低精度(概要文一致)

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Plasma disruptionMAST
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