The effects of an open and closed divertor on particle exhaust during edge-localized mode suppression by resonant magnetic perturbations in DIII-D
The effects of an open and closed divertor on particle exhaust during edge-localized mode suppression by resonant magnetic perturbations in DIII-D
复制标题
DIII-D 中谐振磁扰动抑制边缘局域模式时，打开和关闭偏滤器对粒子排放的影响
DOI：
10.1088/0029-5515/50/3/034011
复制
发表时间：
2010
期刊：
影响因子：
3.3
通讯作者：
D. Orlov
中科院分区：
文献类型：
--
作者：
E. Unterberg;O. Schmitz;T. Evans;R. Maingi;N. Brooks;M. Fenstermacher;S. Mordijck;R. Moyer;D. Orlov
本文比较了偏滤器的几何形状对粒子排气特性的影响，在使用共振磁扰动（RMP）抑制ELM的DIII-D。该主题是及时的，特别是对ITER来说，因为控制或减轻ELM和控制颗粒排放的技术的组合可以提供外部泵送系统完全去除颗粒排放的能力的信心。开放和封闭偏滤器磁拓扑结构之间的差异表明，在封闭偏滤器配置中，扰动撞击点与泵歧管的耦合很强，这可以使粒子排气增加四倍。在该配置中还观察到对q95的依赖性，这是RMP ELM抑制的共同特征。在国际空间站构型的RMP期间，可以看到活动偏滤器和非活动偏滤器中的中性密度增加，并且在封闭偏滤器构型中，可以看到边缘等离子体条件（即ne、sep和Dα的中平面轮廓）增加。最后，抽气排气也被证明有很强的依赖于当地测量的再循环通量。这些观察结果，当作为一个整体，点的等离子体边缘条件，即附近的LCFS，在整个极向截面的真空容器的实质性变化。这与RMP的应用影响系统的泵送能力是一致的。
This paper compares the effects of divertor geometry on particle exhaust characteristics during the suppression of ELM using resonant magnetic perturbations (RMPs) on DIII-D. The subject is timely, particularly for ITER, because the combination of techniques to control or mitigate ELMs and control particle exhaust can provide confidence in the ability of an external pumping system to fully remove the particle exhaust. The differences between an open and closed divertor magnetic topology show a strong coupling of the perturbed strikepoint to the pumping manifold in closed divertor configurations, which can increase the particle exhaust by a factor of four. There is also an observed dependence on q95 in this configuration, which is a common feature of RMP ELM suppression. Neutral density in both the active and non-active divertors is seen to increase during the RMP in the ISS configuration, and edge plasma conditions (i.e. ne,sep and midplane profile of Dα) are seen to increase in the closed divertor configuration. Finally, the pumping exhaust is also shown to have a strong dependence on local measurements of the recycling flux. These observations, when taken as a whole, point to a substantial change in the plasma edge conditions, i.e. near the LCFS, throughout the poloidal cross-section of the vacuum vessel. This is coincident with the application of the RMP affecting the pumping capability of the system.