Modeling of macroscopic melt layer splashing during plasma instabilities
Modeling of macroscopic melt layer splashing during plasma instabilities
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DOI：
10.1016/j.jnucmat.2010.08.032
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发表时间：
2011-08
影响因子：
3.1
通讯作者：
G. Miloshevsky;A. Hassanein
中科院分区：
文献类型：
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作者：
G. Miloshevsky;A. Hassanein
等离子体不稳定性对托卡马克装置面向等离子体部件的损伤一直是影响装置成功运行的重要问题之一。从偏滤器板和附近部件进入堆芯等离子体的宏观熔体损失是重要的材料侵蚀寿命和等离子体污染问题。线性稳定性分析和计算模型被用来预测表面波的等离子体-液体金属界面上的发病和增长。第一次模拟了波浪的发展、增长和破碎的全过程。提出了薄熔体层破裂的新物理机制。研究发现，熔体层经历了宏观运动、大块熔体分裂、液态钨韧带的发展和生长，并最终转变为细丝，最后破碎成液滴。这些结果揭示了瞬时等离子体不稳定性（例如边缘局部模式和破坏）下熔融层的物理行为。
Damage of plasma-facing components in tokamaks due to various plasma instabilities remains one of the most important problems for successful operation. Macroscopic melt losses from divertor plates and nearby components into core plasma are significant material erosion lifetime and plasma contamination issues. The linear stability analysis and computational modeling are used to predict the onset and growth of surface waves on the plasma–liquid metal interface. The whole course of development, growth, and breakup of waves is modeled for the first time. The new physics mechanism involved in breakdown of a thin melt layer is presented. It is found that the melt layer undergoes macroscopic motion, bulk melt splitting, development and growth of liquid tungsten ligaments that transform to thin threads and eventually break into droplets. These results shed light on the physical behavior of a melt layer under transient plasma instabilities such as edge-localized modes and disruptions.