EAST托卡马克中比压阿尔文本征模的实验研究

比压阿尔文本征模(BAEs)是一类重要的MHD不稳定性，首先在DIII-D装置发现并在TFTR装置上重复，该模特征为频率正比于阿尔文速度。BAEs实验现象先后在高能离子、欧姆放电以及高能电子等离子体中观察到，为了解释BAEs现象的物理机制，形成了几种典型的模型：阿尔文本征模，动理气球模，离子热速度，高能粒子模，包括近年发展的磁岛诱发自由能激发BAEs模以及剪切阿尔文本征模连续谱与低频磁岛相互耦合产生低频BAEs的"GAP"结构。但是这些简单的理论都不能很好的解释BAEs模的频率特征。.EAST托卡马克拥有与ITER类似的全超导非圆截面，因此在EAST装置上开展BAEs物理实验，研究EAST不同放电条件(ICRF加热、纯欧姆加热以及低杂波加热)的BAEs模特征，并分析这些BAEs与其他等离子体参数之间的关系及可能符合的理论模型，这些结果将进一步促进我们对ITER中BAEs特征的理解。

BAEs is an important MHD instabilities which was first observed in DIII-D and then identified in TFTR tokamak. It is evident that the frequency of BAEs is proportional to the Alfven velocity. The phenomenon of BAEs with characteristic of Alfven Eigenmodes?were observed in energetic ions, ohmic and energetic electrons plasmas.?It has developed kinds of theoretical modes to explain BAEs, as Alfven Eigenmodes, Kinetic Ballooning Modes, Ion Thermal Velocity Modes and Energetic Particle Modes, magnetic island-induced free energy can excitated BAEs and Shear Alfven Eigenmodes (SAW) continuous spectrum is nonlinear interacted with low frequency MHD fluctuations can induce Alfven gap structure. However, none of these simple theroies match the data..EAST is full superconductor tokamak with the similar non-circle cross section as ITER, so the BAEs physics on EAST (contain: BAEs corresponding to different discharege parameters like ICRF, Ohmic, LHW plasmas and the relation between the phenomenon and theory models) can reflect the effect that burst on ITER.