HL-2A边缘等离子体中捕获电子模的线性数值模拟

Linear gyrokinetic simulation of trapped electron mode in edge plasma of the HL-2A tokamak

利用GTC程序和HL-2A装置的实验数据,对托卡马克边缘等离子体中的漂移波微观不稳定性进行了线性数值模拟。模拟结果表明,在HL-2A边缘等离子体中捕获电子模(TEM)是不稳定的,它均匀且规则地分布在托卡马克的弱磁场区域,而且其增长率随着等离子体的温度梯度和密度梯度的增加而增加。另外,模拟结果还表明,TEM的实频率远远小于离子的漂移频率,这一点与理论研究结果是一致的。

The global gyrokinetic toroidal code （GTC） simulation and the data of HL-2A experiments were used to study the trapped electron mode, search and understand the possible mechanism of the mieroinstabilities which existed in the edge plasmas of HL-2A tokamak. In the GTC linear simulation, the trapped electron mode （TEM） is strongly unstable and distributes in the week magnetic area regularly in the edge plasma of the HL-2A tokamak. The unstable TEM instability is related with the intensity of density and temperature gradients. The results also shows that the TEM frequency is smaller than the drift frequence. This is in consistent with the theoretical results.