边界局域模（ELM）相关物理是目前磁约束聚变研究的重要课题之一。ELM丝状结构（filaments）直接携带了ELM的部分粒子和能量，短时间内沉积在很小的区域，所以丝状结构会引起很大的局域热量和粒子沉积，导致第一壁和偏滤器靶板材料的侵蚀，带来杂质溅射和粒子再循环问题。由于诊断技术时空分辨能力的限制，ELM-filaments温度和密度演化精细结构的研究在国内尚未开展。本课题正是针对其问题的重要性和现实性，提出以边界高空间分辨率汤姆逊散射诊断为主要工具，通过实现多道激光合束技术提高系统的时间分辨率、设计光束同步监测系统提高电子密度测量的精度和可信度，实现对ELM-filaments电子温度和密度分布参数的同步、精确测量。研究不同密度和放电位形的实验数据，统计分析其演化特征和衰减尺度。本课题的完成将为EAST上L-H转换等快过程的研究提供基本工具，为EAST高功率、长脉冲H模放电提供参考数据。

The physics research related to Edge-localized mode (ELM) is one of the important issues which is magnetic confinement fusion research. ELM-filaments carry directly parts particles and energy of ELMs, which deposit within a short time and locate in a small area. As a result, ELM-filaments could cause locally serious heat and particle deposition, leading to material erosion of both the first wall and divertor target plates, impurity sputtering and particles recycling problems. Due to the limit of diagnostic techniques spatial and time resolution, the fine structure of electron temperature and density profile of ELM-filaments has not been investigated so far in our country. This application takes aim the importance and reality of filaments and is based on the actual high spatial resolution edge Thomson scattering diagnostic. Using multi-beam combiner technology to improve the time resolution(up to 8 microseconds) and real-time monitoring of beam boundary to improve density measurement accuracy and reliability of the system, the applicants schedule to achieve the synchronization and accurate measurements of ELM-filaments electron temperature and density distribution. In addition, both analyzing the experimental data of different plasma parameters (especially the density) and different discharge shapes, and studying the features of filaments evolution (especially the attenuation scale) are also an important research subject. The completion of this project will provide the basic tools for other fast physical processes study, such as L-H transition and the experimental results should supply a reference for EAST H-mode operation.