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(OV/5-1) High Performance Discharges in the HT-7 and HL-1M Tokamaks

Jiangang Li1), Baonian Wan1), Jiarong Luo1), Yanping Zhao1), Xiaodong Zhang1), Junyu Zhao1), Fukun Liu1), Xuemao Guo1), Guangli Kuang1), Yuejiang Shi1), HT-7 Team1), Yong Liu2), Xuantong Ding2), Lianghua Yao2), Yi Liu2), Jiafu Dong2), Jung Riao2), Zhen Feng2), Enyao Wang2), HL-1M Group2)
1) Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China
2)Southwestern Institute of Physics, Chengdu, Sichuan, China

Abstract.  Significant progress in obtaining high performance discharges under quasi-steady-state in the HT-7 super-conducting tokamak has been realized since the last IAEA meeting. HT-7 has produced a variety of discharges with $ \beta_{N}^{*}$H89  >  1 $ \sim$ 4 for a duration of several to several tens energy confinement times with non-inductive driven current of 50-80%. The duration at H89  >  1.5 with $ \beta_{N}^{}$ $ \sim$ 1 has been extended to 130 energy confinement times. The reproducible long pulse discharge with T - e $ \sim$ 1 keV and central density $ \sim$ 1x1019m- 3 can be easily obtained with duration of 10-20 seconds. In the HL-1M tokamak, a kinetic MHD instability during ECRH and combined ECRH and LHCD was observed. This instability was driven purely by energetic electron. By using high-pressure supersonic molecular beam injection, very high density and evidence of the onset of clustering were obtained.

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IAEA 2003