边缘局域模（ELM）是托卡马克H-模边缘区等离子体的一种周期性弛豫行为，会造成边缘台基区域热能、粒子损失，直接为托卡马克第一内壁和偏滤器板等边缘器壁材料带来高功率负荷脉冲，加速材料的老化、损伤过程，这一问题对ITER尤为显著。然而，由于托卡马克边缘等离子体物理的复杂性，ELM的触发、损失、和控制机制仍是磁约束聚变物理前沿基础问题之一。以超声分子束抑制ELM以及ELMy-free状态下小尺度湍流都会增长这一现象为突破口，利用EAST装置上的两套多道多普勒微波反射计系统，本项目计划以边缘区振荡模式的模结构和产生的粒子输运为研究对象，通过EAST装置上多种可以抑制ELM的实验手段(超声分子束、低杂波加热以及共振磁扰动线圈)，探索多种尺度的准相干模或者湍流模式对ELM抑制的动力学过程的影响。本项目的研究内容对揭开ELM的触发以及控制机制有着重要的意义。

Edge-localized modes (ELMs) is a kind of quasi-periodic process during H-mode in the Tokamak edge plasmas, which could cause a large, transient flux of energy and particle loss from the pedestal region, and provide high power bursts on the first wall and divertor of the Tokamak, accelerating the thermal ageing and erosion of these materials. This problem is much more serious in ITER. However, the trigger,relax and controlling of ELMs is still one of the frontier foundation problems due to the complexity of the edge plasma physics on Tokamak. Based on the observation that small scale turublence increases both during ELMy free stage and ELM mitigation process caused by supersonic molecular beam injection (SMBI), we plan to measure the mode structure and caused particles transport of the edge fluctuations through the multi-channel Doppler reflectometers on EAST, including both small scale and large scale quasi-mode or turublence, and then explore the effect of these edge fluctuations during the ELM mitigation and suppression through various controlling methods on EAST (SMBI, low hybrid wave heating, resonant magnetic pertubations). The research of this project has important significance on uncovering the trigger and control mechanisms of ELM.