HL-2A装置中阿尔芬本征模的数值模拟

Numerical Study of Alfvén Eigenmode in HL-2A Tokamak

采用GTAW程序模拟研究了HL-2A装置等离子体中的阿尔芬(Alfvén)本征模,得到了典型放电条件下的本征频率和模结构及等离子体密度分布对本征频率和模结构的影响。计算得到的环形阿尔芬本征模(TAE)间隙中的本征频率99.09、74.90和99.17kHz与实验观察到的高频Alfvén本征模频率相吻合。计算还发现,等离子体中心电子密度的增大会导致TAE的本征频率减小,但不影响模的径向位置和结构。

The Alfvén eigenmode in the HL-2A Tokamak plasmas was analyzed numerically with GTAW code.The eigenfrequency and mode structure of the toroidicityinduced Alfvén eigenmode（TAE）,as well as the effect of plasma density distributions on them were studied.Under the typical experimental conditions,the calculated eigenfrequencies of TAE are 99.09,74.90 and 99.17 kHz,respectively,which are in agreement with the experimental observation result.It is also found that the TAE eigenfrequency decreases and changes of the mode position and structure are negligible when the core electron density increases.