HL-1M 装置的氦辉光放电清洗的清除率研究

THE REMOVING EFFICIENCY OF HEGDC IN HL-1M TOKAMAK

通过对ＨＬ－１Ｍ的氦直流辉光放电清洗（ＨｅＧＤＣ）的放电特点和清除效率的研究，发现环形真空室的对称性导致与阳极截面相对称的区域的场强很弱，使其阴极位降区的厚度远大于氦离子的平均自由程，严重影响辉光清除效率。提出采用多电极不对称阳极电位的辉光放电来提高清除效率。

By studying the characteristics of discharge and the removing efficiency of HeGDC in the HL-1M Tokamak, we found that the electric field near the symmetric position of the anode section was very weak, and the depth of the cathodic potential fall was much larger than the free mean path of He ions,which lde to a serious reduction of removing efficiency.We pointed out that the using of multianodes asymmetrically in HeGDC could improve the removing efficiency.