摘要
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.
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.
基金
supported by National Natural Science Foundation of China (Nos. 10875149, 10928509 and 10805057)
the National Magnetic confinement Fusion Science Program of China (2010GB105004)
the Dean Foundation of Hefei Institute of Physical Science,Chinese Academy of Science
partly supported by Core University Program between China and Japan
