在HT-7超导托卡马克中进行了低杂波电流驱动的功率扫描实验，功率变化范围为100 kW至700 kW，频率为2.45 GHz。研究了等离子体平均有效电荷数及电子温度与低杂波功率之间的关系。给出了不同功率下低杂波电流驱动效率与有效电荷数及电子温度之间的关系：HT-7装置低杂波驱动效率与电子温度成正比，与有效电荷数成反比。指出了动态杂质控制是改善低杂波电流驱动效率的关键问题。

The lower hybrid current drive experiment has been performed on the HT-7 tokamak. The wave power varied from 100 kW to 700 kW with a frequency of 2.45 GHz. The relation between the power of lower hybrid wave and the average effective charge number and electron temperature was studied. It is shown that the current drive efficiency is proportional to the electron temperature, and inversely proportional to the effective charge number. The dynamic control of the impurity of plasma is a key to improve the current drive efficiency.