ELM不稳定性发生时所引起的瞬态高热负荷问题是开展长脉冲H模运行必须解决的关键问题之一。因此，开展ELM物理研究并寻找有效的控制方法十分必要。ELM的爆发同台基区等离子体行为密切相关，实验上对ELM发生时引起的刮削层（SOL）输运过程研究已取得了很大的进展。但是, 由于诊断手段的缺乏，对台基的二维结构及其动力学演化的研究仍十分有限。随着加热系统和内部部件的升级完成，EAST装置的I类ELMy H模运行已经常态化。为进一步理解ELM背后的物理过程，EAST实验组研制了一套针对台基区的真空紫外高速成像系统，用于获取台基区等离子体的二维结构及其演化信息。结合可见光高速成像系统，及刮削层诊断，可以对ELM发生时从台基顶部到刮削层区域内的等离子体进行直接测量。本项目将基于EAST平台，利用上述诊断系统，开展不同放电条件下的H模二维ELM动力学演化相关研究。

During the long-pulse H mode operation, one of the key issues to be solved is the transient high heat flux induced by the ELM event. Therefore, it is urgent to understand mechanism of ELM and develop efficient methods to control it. Experimentally, it is found that ELM event is strongly related with the evolution of pedestal, and big progress has been obtained on the study of ELM induced transport in the SOL region. However, studies on the 2D pedestal structure and dynamics are very limit due to the lack of diagnostics for pedestal. After the upgrade of the heating system and internal components of EAST in the past several years, the operation with type I ELM H mode becomes normal. In order to obtain a deeper understanding on the underlying physics of ELM event, EAST group developed a high-speed VUV imaging system for pedestal, which can obtain information of the 2D pedestal structure and its temporal evolution. Combined the visible high-speed imaging system and related diagnostics in SOL region, direct measurement can be made from the top of pedestal to SOL region. Based on the EAST platform, this proposal will make use of these diagnostics mentioned to study the 2D ELM dynamics under different plasma conditions.