以托卡马克为代表的磁约束聚变研究被认为是最可能获取可控核聚变能的途径。托卡马克的高比压运行模式具有高聚变反应率、高自举电流和经济性等优点，是未来聚变堆运行的主要模式之一。研究表明，在高比压条件下，电磁湍流，特别是微撕裂模容易被激发，并可能成为影响输运与约束的主要因素。因此，开展关于微撕裂模的研究具有重要意义。本课题拟开展关于微撕裂模增长机制及其对输运影响的实验研究。基于J-TEXT托卡马克，以激光偏振仪为主，结合其他诊断，实现对微撕裂模的直接观测。分析微撕裂模饱和幅度与主要等离子体参数的关系，探索其增长机制。同时研究其饱和幅度与整体输运水平的关系，定量地评估该模式对等离子体输运的影响。课题研究成果预期可加深对微撕裂模的理解，为高比压运行下等离子体约束与输运的改善提供参考。

Magnetic-Confined-Fusion research, represented by tokamak, has been widely recognized as the most promising way for controlled fusion energy. High-Beta operation of tokamak is considered the major scenario because of its high fusion gain, high bootstrap current and economy. It is known Electro-Magnetic turbulence, especially Micro-Tearing mode become unstable and may play an important role in confinement and transport in high-Beta operation. Therefore, there is urgent need on the experimental study of Micro-Tearing mode. This project proposes to study Micro-Tearing mode and associated transport experimentally. Utilizing J-TEXT tokamak and its diagnostics, especially laser polarimeter, it is proposed to observe Micro-Tearing mode directly from experiment. Based on the observation, the parametric dependence of its growth rate will be studied by analyzing the relation between saturation level and plasma parameters. Its effect on transport will also be quantitatively explored by studying the relation between its saturation and plasma transport level. These results will help to understand Micro-Tearing mode and provide reference to improve confinement and transport in high-beta operation.