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首页> 外文期刊>Plasma physics and controlled fusion >Investigation of conventional and Super-X divertor configurations of MAST Upgrade using scrape-off layer plasma simulation
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Investigation of conventional and Super-X divertor configurations of MAST Upgrade using scrape-off layer plasma simulation

机译：使用刮除层等离子体模拟研究MAST Upgrade的常规和Super-X偏滤器配置

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One of the first studies of MAST Upgrade divertor configurations with scrape-off layer plasma simulation (SOLPS) 5.0 are presented. We focus on understanding the main prospects associated with the novel geometry of the Super-X divertor (SXD). This includes a discussion of the effect of magnetic flux expansion and volumetric power losses on the reduction of target power loads, the effect of divertor geometry on the divertor closure and the distribution of neutral species and radiation in the divertor, and the role of the connection length in broadening the target wetted area. A comparison in conditions typical for MAST inter-ELM H-mode plasmas confirms the improved performance of the Super-X topology resulting in significantly better divertor closure with respect to neutrals (the atomic flux from the target increased by a factor of 6, but the atomic flux from the divertor to the upper SOL reduced by a factor of 2), increased radiation volume and increased total power loss (a factor of 2) and a reduction of target power loads through both magnetic flux expansion and larger volumetric power loss in the divertor (a factor of 5-10 in attached plasmas). The reduction of the target power load by SXD further increases with collisionality (high density or detached regimes) thanks to the larger importance of volumetric power losses. It is found that a cold divertor plasma leads to stronger parallel temperature gradients in the SOL which drive more parallel heat flux, meaning that the effectiveness of perpendicular transport in spreading the power at the target can be reduced, and this needs to be taken into account in any optimization.
机译：提出了带有刮层等离子体模拟（SOLPS）5.0的MAST升级偏滤器配置的第一项研究。我们专注于了解与Super-X偏滤器（SXD）的新颖几何形状相关的主要前景。这包括讨论磁通膨胀和体积功率损耗对降低目标功率负载的影响，偏滤器几何形状对偏滤器闭合以及偏滤器中中性物质和辐射的分布的影响，以及连接的作用长度以扩大目标润湿区域。对MAST间ELM H模式等离子体的典型条件进行的比较证实，Super-X拓扑的性能得到了改善，相对于中性点，分叉器关闭效果明显更好（来自目标的原子通量增加了6倍，但从发散器到上层SOL的原子通量减少了2倍，辐射量增加，总功率损耗增加了2倍，并且通过磁通量膨胀和较大的体积功率损耗，目标功率负载也降低了偏滤器（在附着的血浆中为5-10的因子）。由于体积功率损耗的重要性越来越大，通过SXD降低目标功率负载会随着碰撞（高密度或分离状态）而进一步增加。发现冷偏滤器等离子体会导致SOL中更强的平行温度梯度，从而驱动更大的平行热通量，这意味着可以降低垂直传输在目标上散布功率的效率，因此需要考虑到这一点。在任何优化中。

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