1. Lower Hybrid Current Drive Effects on HT-7 Superconducting Tokamak
- Author
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Bo-jiang Ding, Yu-de Fang, Yuan-xi Wan, Lian-quan Shang, Qian-chun Jin, Hengyu Fan, Chun-sheng Yang, Deng-cheng Liu, Ji-kang Xie, Yue-xiu Liu, Jun-shuan Wu, Wei-hua Xu, Xiang-qin Zhang, Guangli Kuang, Yuan-wei Zhou, Han-dong Xu, Jian-an Lin, Guang-hua Zheng, Jiafang Shan, and Fukun Liu
- Subjects
Physics ,Tokamak ,Phase (waves) ,General Physics and Astronomy ,Pulse duration ,Electron ,Plasma ,Lower hybrid oscillation ,law.invention ,Ray tracing (physics) ,Physics::Plasma Physics ,law ,Atomic physics ,HT-7 - Abstract
Lower hybrid current drive (LHCD) experiments have been done on the superconducting Tokamak HT-7 by using a new developed long pulse megawatt lower hybrid wave system. An LHCD efficiency of 0.5 × 1019 Am-2/W in a pulse length of several hundreds of milliseconds has been achieved. After boronization of the tokamak vacuum vessel, considerable improvements of plasma energy confinement and particle confinement during LHCD phase have been achieved by adjusting wave spectra. An energy transfer from the lower hybrid wave to plasma bulk electrons has been demonstrated experimentally. A computer simulation of the LHCD experiments by using a ray tracing code combined with a two dimensional Fokker-Planck code is in good accordance with experimental measurements and suggests an important role of plasma current profile.
- Published
- 1998