EAST辉光放电清洗电极的升级及实验研究

Upgrade and Experimental Studies of EAST Glow Discharge Cleaning Electrode

本文介绍了EAST装置辉光放电清洗电极的升级及实验研究。在常规的杆式辉光电极基础上,升级为具备主动水冷散热的板式电极,通过数值模拟和实验研究,证实新电极能满足辉光电流从3 A提升至6 A的散热需求,可长时间稳定运行。新电极在1000 V电压下的击穿气压略低于常规电极,提高He辉光运行电流,从而显著提升对氘(D)的清除率。使用常规的12 A(3 A×4个电极)辉光电流下对D的清除率为1.04×10^(23)atoms/h,电流提升一倍至24 A可将清除率提升至2.4倍(2.46×10^(23)atoms/h)。本文研究结果显示新升级的辉光电极能够稳定运行在6 A电流下,极大地提高了对D的清除率,为未来EAST托卡马克的实验运行提供了高效率的壁处理手段。

The electrode of Glow Discharge Cleaning(GDC) in EAST tokamak was upgraded to an active water-cooling plate anode. Both numerical simulation and experimental studies have confirmed that the new electrode can meet the requirement of heat dissipation with an increased glow current from 3 A to 6 A. Experimental results in EAST show that the breakdown pressure using the new electrode is slightly lower than that using a normal electrode at 1000 V voltage. It is also found that the deuterium removal rate of helium GDC is increased from 1.04×10^(23) atoms/h with a normal glow current of 12 A(3 A×4 electrodes), to 2.46×10^(23) atoms/h with doubled glow current of 24 A, i.e.,2.4 times higher than before. The results in this paper show that the newly upgraded glow electrode can operate stably at a 6 A current, which greatly improves the deuterium removal rate. It provides an efficient wall conditioning method for future EAST experiments.