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

Significant progress in obtaining high performance discharges under a quasi-steady-state condition in the HT-7 super conducting tokamak has been realized since the last IAEA meeting. HT-7 has produced a variety of discharges with βN*H89 > 1-4 for a duration of several to several tens of energy confinement times with a non-inductive driven current of 50-80%. The duration at H89 > 1.5 with βN ~1 has been extended to 130 energy confinement times. A reproducible long pulse discharge with Te ~ 1 keV and central density ~ 1x10m can be easily obtained with a 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 electrons. By using high-pressure supersonic molecular beam injection, very high density and evidence of the onset of clustering were obtained. 1. High Performance Discharges in the HT-7 Superconducting Tokamak