AI 中文总结
针对MAST装置中RMP引发的等离子体密度降低问题，采用0维粒子平衡分析与自主开发的MRPB模型，结合EMC3-EIRENE建模，明确中性粒子加料的变化是导致该现象的原因之一。
AI 中文摘要
已有研究表明，在MAST装置的L模和H模放电中，施加特定构型的共振磁扰动（RMPs）会引发等离子体泵出。本文探讨中性粒子加料对该密度降低的影响，采用0维粒子平衡分析计算中性粒子加料及主离子的平均粒子约束时间τ_p。结果显示，施加RMPs时，L模放电的电离过程增强，τ_p降低15%；H模的边缘局域模（ELM）间阶段也出现类似结果。为进一步探究中性粒子在密度变化中的作用，本文开发了含原子和分子储层的时变全局多储层粒子平衡（MRPB）模型，该模型可准确复现实验测得的密度降低和电离增强，其原因可能是τ_p降低或粒子加料效率下降。EMC3-EIRENE的建模结果表明，该变化可归因于RMP施加导致边缘区域形成混沌场线，原本闭合的场线打开后，中性粒子加料发生在这些新打开的场线位置。
英文摘要
The application of certain configurations of resonant magnetic perturbations (RMPs) has been shown to cause a plasma pump-out in both L- and H-mode discharges at MAST. In this paper we discuss the impact of neutral fueling on this density reduction. The neutral fueling and average particle confinement time $τ_p$ of the main ion species were calculated using a 0-D particle balance analysis. When the RMPs were applied, it was found that there was an increase in ionizations and a 15$\%$ reduction in $τ_p$ for L-mode discharges and a similar result for inter-ELM (edge localized modes) periods of H-mode discharges. A time-dependent global multi-reservoir particle balance (MRPB) was developed, which included atomic and molecular reservoirs, to further investigate the role neutrals had on the density change. We discuss how this model was able to accurately reproduce the experimentally measured density reduction and ionization increase due to either a reduction in $τ_p$ or a reduction in particle fueling efficiency. Results from EMC3-EIRENE modeling indicate this change could be attributed to neutral particle fueling occurring in locations with now-opened field lines due to the chaotic edge-region from RMP applications.
Comments26 pages, 15 figures, submitted to Nuclear Fusion
