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Numerical investigation of disruption characteristics for the snowflake divertor configuration in HL-2M

机译：HL-2M雪花分散器结构破坏特性的数值研究

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摘要

Cold and hot vertical displacement events (VDEs) are frequently related to the disruption of vertically-elongated tokamaks. The weak poloidal magnetic field around the null-points of a snowflake divertor configuration may influence the vertical displacement process. In this paper, the major disruption with a cold VDE and the vertical disruption in the HL-2M tokamak are investigated by the DINA code. In order to better illustrate the effect from the weak poloidal field, a double-null snowflake configuration is compared with the standard divertor (SD) configuration under the same plasma parameters. Computational results show that the weak poloidal magnetic field can be partly beneficial for mitigating the vertical instability of the plasma under small perturbations. For major disruption, the peak poloidal halo current fraction is almost the same between the snowflake and the SD configurations. However, this fraction becomes much larger for the snowflake in the event of a hot VDE. Furthermore, during the disruption for a snowflake configuration, the distribution of electromagnetic force on a vacuum vessel gets more non-uniform during the current quench.
机译：冷和热的垂直位移事件（VDE）通常与垂直伸长的托卡马克的破裂有关。雪花偏滤器配置的零点附近的弱极化磁场可能会影响垂直位移过程。在本文中，通过DINA代码研究了冷VDE的主要破坏和HL-2M托卡马克的垂直破坏。为了更好地说明弱多极电场的影响，在相同的等离子体参数下，将双零雪花配置与标准偏滤器（SD）配置进行了比较。计算结果表明，微弱的极化磁场可部分缓解小扰动下等离子体的垂直不稳定性。对于重大破坏，雪花和SD配置之间的峰极晕电流峰值几乎相同。但是，在热VDE的情况下，雪花的比例会变得更大。此外，在雪花形状的破坏期间，在真空容器上的电磁力的分布在电流骤冷期间变得更加不均匀。

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