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A new scaling for divertor detachment

机译：转移器分离的新缩放

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The ITER design, and future reactor designs, depend on divertor `detachment,'whether partial, pronounced or complete, to limit heat flux to plasma-facing components and to limit surface erosion due to sputtering. It would be valuable to have a measure of the difficulty of achieving detachment as a function of machine parameters, such as input power, magnetic field, major radius, etc. Frequently the parallel heat flux, estimated typically as proportional to P-sep/R or PsepB/R, is used as a proxy for this difficulty. Here we argue that impurity cooling is dependent on the upstream density, which itself must be limited by a Greenwald-like scaling. Taking this into account self-consistently, we find the impurity fraction required for detachment scales dominantly as power divided by poloidal magnetic field. The absence of any explicit scaling with machine size is concerning, as P-sep surely must increase greatly for an economic fusion system, while increases in the poloidal field strength are limited by coil technology and plasma physics. This result should be challenged by comparison with 2D divertor codes and with measurements on existing experiments. Nonetheless, it suggests that higher magnetic field, stronger shaping, double-null operation, `advanced' divertor configurations, as well as alternate means to handle heat flux such as metallic liquid and/or vapor targets merit greater attention.
机译：ITER设计和未来的反应堆设计，取决于转移器`脱离，'是否部分，发音或完整，将热通量限制在面向等离子体的组件上，并限制由于溅射引起的表面侵蚀。具有作为机器参数的函数实现分离的难度，例如输入功率，磁场，主要半径等常见是有价值的。通常是平行热通量，通常与p-sep / r成比例或psepb / r，用作这种困难的代理。在这里，我们认为杂质冷却取决于上游密度，其本身必须受到格兰瓦特的缩放的限制。考虑到自来组织，我们发现分离尺度所需的杂质分数如因子磁场除以功率。由于P-Sep肯定必须在经济融合系统中肯定会增加任何明确的缩放，因此对于经济融合系统必须大大增加，而单极场强的增加受线圈技术和等离子体物理的限制。通过与2D偏移器代码和现有实验进行测量，应挑战该结果。尽管如此，它表明较高的磁场，更强的成形，双零操作，“先进”的转移器配置，以及处理诸如金属液体和/或蒸气靶的热通量的替代方法优异。

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