EAST放电过程中硼粉实时注入抑制I型边界局域模的模拟研究

随着EAST等离子体参数的不断提高和第一壁的不断升级，如何实现对边界局域模（ELM）的有效控制，尤其是对I型ELM的抑制缓解，以降低ELM爆发对偏滤器靶板的瞬态热冲击，成为EAST和未来聚变装置长脉冲稳态运行亟需解决的问题。实验上利用硼粉实时注入，在EAST托卡马克装置上已成功实现了对I型ELM的抑制，但是硼粉实时注入对I型ELM抑制物理过程及机制尚不清楚。本项目基于EAST托卡马克实验结果，采用理论模拟的方法，从硼粉实时注入缓解ELM所涉及的等离子体与注入硼杂质的输运过程出发，约化Braginskii方程，建立硼杂质和背景等离子体自洽的、相互耦合的物理模型。在BOUT++大型模拟程序架构下，建立相应的模块，模拟研究硼粉实时注入对ELM物理过程的影响并与实验结果进行对比，以理解硼粉注入抑制ELM的物理机制。本项目将为EAST未来实验中抑制ELM提供有效参考。

With the constant improvement of the plasma parameters and the escalating metal wall, how to mitigate or eliminate the edge localized mode (ELM) effectively, especially the Type-I ELM, in order to reduce the damage of ELM eruption on the divertor target, has become an urgent problem for the steady-state operation of EAST and future devices. The real-time injection of the boron powder has successfully eliminated ELMs in EAST. However, the physical process and mechanism of real-time boron powder injection on Type-I ELM suppression are still unclear. We will establish a self-consistent physical model of the real-time boron powder injection in the edge plasma by reduced Braginskii equations based on the experimental results in EAST. Under the BOUT++ framework, a powerful tool to simulate the boundary plasma turbulence code, we will build a suitable physical module code to simulate the process of the ELM suppression induced by real-time boron injection including the explosion and reformation of type-I ELM, and compare it with the experimental results to figure out the physical mechanism behind the ELM suppression. The research output of this project could provide a useful reference on ELM suppression experiments for EAST.