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Lower hybrid current drive experiments and improved performance on the HT-7 superconducting tokamak

1999; IOP Publishing; Volume: 39; Issue: 11Y Linguagem: Inglês

10.1088/0029-5515/39/11y/317

1741-4326

Kuang Guang-li, Yuexiou Liu, Jiafang Shan, Weihua Xu, Xiangqin Zhang, Dengcheng Liu, Fukun Liu, Yubao Zhu, Cheng Zhang, Guanghua Zheng, Jun-shuan Wu, Jianan Lin, B. Ding, Handong Xu, Yude Fang, Jiangang Li, Jiarong Luo, Xiaodong Zhang, Baonian Wan, Zhao Qingchu, Jianshan Mao, Xiang Gao, Shouyin Zhang, Cheng‐Fu Li, Xuemao Gu, Pinjian Qing, Heng‐Yu Fan, Shengxia Liu, Bili Ling, Bolong Ding, Yahong Li, Zhengwei Wu, Yinxian Jie, Sheng Liu, Jikang Xie, Yuanxi Wan,

Fusion materials and technologies

The feedback control system to control plasma current and position on the HT-7 superconducting tokamak was greatly improved in early 1998. Lower hybrid current drive (LHCD) experiments with the improved control system were performed to sustain long pulse discharges and to improve plasma confinement. Partial non-inductive current drive and full non-inductive current drive for several seconds by means of LHCD were demonstrated. It was observed that plasma confinement could be considerably improved by LHCD. Experimental evidence suggests that this improvement during the LHCD phase could be due to the modification of the current profile in the outer region of the plasma. MHD modes (especially m = 2) seem unstable with such a current profile. The EFIT code was modified for the reconstruction of the magnetic surfaces in HT-7 and a test computation was performed.