EAST上低杂波电流驱动最新实验结果

Recent Results of LHCD Experiments in EAST

摘要: 在EAST托卡马克上系统进行了偏滤器和限制器位形下低杂波与等离子体的耦合和低杂波电流驱动的实验研究。到目前为止, 最大的低杂波入射功率为1.4MW, 最大的低杂波等离子体电流为1MA。在目前较低的等离子体参数下, 研究表明限制器位形下低杂波与等离子体的耦合最好, 其次是单零, 双零最差；驱动效率研究结果表明单零位形和双零位形没有明显的差别, 限制器位形时的驱动效率偏低；电流驱动效率受等离子体密度影响, 分析表明主要与密度对杂质浓度的影响有关。

Abstract: Lower hybrid wave (LHW)-plasma coupling and lower hybrid current drive (LHCD) experiments in divertor, including single-null and double-null, and limiter configurations were conducted systematically in EAST. A maximum power for launched LHW is 1.4 MW and the plasma current with LHCD is about 1 MA. It is indicated that the coupling is best in limiter configuration, then in single-null one, while worst in double-null one. Study in current drive efficiency by a least squares fit shows that there is no obvious difference in drive efficiency between the double-null and the single-null cases, whereas the efficiency is a slightly lower in the limiter case. The effect of plasma density on the current drive efficiency is due to the influence of density on impurity concentration.