反剪切阿尔芬模（RSAE）是反剪切位形下高能粒子与阿尔芬波相互作用而激发的本征模，其主要特征为频率随着最小安全因子qmin变化而具有扫频行为。RSAE可以排出高能粒子，使得等离子体约束变差；又可以作为诊断工具用来检测等离子体参数，如qmin。因此，深入分析RSAE的激发机制、非线性行为以及对背景等离子体输运影响，对提高ITER等离子体约束具有重要意义。本项目将在HL-2A/2M装置上开展RSAE的实验研究。首先，研究RSAE在电子回旋加热（ECRH）条件下的基本特征，结合相关理论阐述高能电子对RSAE产生作用的机制。其次，从实验上分析诱导RSAE与撕裂模（TM）非线性模模耦合的依赖因素并通过与现有理论模型比较，确定依赖参数信息。最后，阐明RSAE对背景等离子体热输运的影响。

Reversed shear Alfvén eigenmode (RSAE) are typical of the discrete shear Alfvén wave (SAW) spectrum in a reversed or weak magnetic shear plasma. They are characterized by frequency sweeping following the minimum safety factor qmin evolution. On one hand, they may induce excessive alpha particle losses and deteriorates fast ion confinement. On the other hand, RSAEs imply the presence of a reversed shear q-profile, and as a result the RSAE phenomenon can serve as a useful plasma diagnostic for the measurement of safety-factor profiles. Therefore it is important to study the properties of RSAEs, such as the stability of the modes, their non-linear behaviors, as well as effect on the plasma transport. Investigation of RSAEs will be carried out on HL-2A/2M in this project. Firstly, basic characteristic of RSAEs during electron cyclotron resonance heating (ECRH) can be measured by relevant diagnostics and the mechanism of ECRH effecting on RSAE will be investigated. Secondly, evolution of nonlinear behaviors will be studied, then compared to the previous theoretical models so that the defining parameters can be found out. Finally, research about influences of RSAEs on the plasma transport will be taken place.