Portal de Periódicos da CAPES

Effects of Plasma Density and Toroidal Magnetic Field on Lower Hybrid Current Drive Efficiency on HT-7 Tokamak

2000; Institute of Physics; Volume: 17; Issue: 7 Linguagem: Inglês

10.1088/0256-307x/17/7/020

1741-3540

Ding Bo-Jiang, Kuang Guang-li, Yuexiu Liu, Liu Deng-cheng, Guanghua Zheng, Wu Jun-shuan, Liu Fukun, Shen Wei-ci, Jianan Lin, Yang Chun-sheng, Xu Handong, Jiawen Yu, Yiyun Huang, Shang Lian-Quan, Yuejiang Shi, Zhenwei Wu, Jinsong Zhang, Fuxian Yin, Xiaodong Zhang, Xiaoning Liu, XIE JI-KANG, Wan Yuan-xi,

Ionosphere and magnetosphere dynamics

Lower hybrid current drive experiments on the HT-7 device have been carried out by scanning the following parameters: central line averaged electron density (ne = 0.6 - 2.0 × 1019 m-3) and toroidal magnetic field (Bt = 1.62 - 2.0 T). The dependence of current drive efficiency on these parameters has been studied and the experimental curves of current drive efficiency as a function of ne and Bt have also been obtained. From these experimental results, it can be seen that current drive efficiency rises with the increase of toroidal magnetic field. As plasma density increases, the current drive efficiency first increases to a certain value, then gradually decreases, that is, there exists an optimized density regime where a better drive efficiency can be obtained. The analysis shows that the current drive efficiency is mainly affected by wave accessibility and impurity concentration, and the competition of these two factors determines the current drive efficiency.