CT-6B托卡马克的交流运行实验研究

Experimental study of alternating current operation on CT-6B Tokmak

在CT-6B托卡马克上首次实现了多周期交流运行,对多个周期中等离子体进行比较发现,尽管在每个周期的两个半周中等离子体与壁的相互作用有所不同,但等离子体中的杂质积累并未受到严重影响。通过内磁探针测量了等离子体电流密度的分布,发现等离子体电流首先从弱场区开始反相,电流反相过零时同时存在正负局部等离子体电流,此时的磁面结构有效地约束了粒子。

Multi-cycle AC operation was firstly carried out in CT-6B Tokamak, and plasmas in different cycles were compared. The results show that although there are differences in the plasma-wall interactions in the two halves of each AC cycle, the purity of plasma is not significantly affected. The distribution of plasma current density was measured by a set of internal magnetic probe system. It was found that the plasma current is firstly reversed on the low field side, and the local positive and negative currents coexist as the net current passes zero, in which case the particles are efficiently confined by the magnetic surfaces.