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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 Group^2)
 
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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