Abstract： The normalized performance indicated by the product of βNH89 > 2 was achieved by a combination of the lower hybrid current driving (LHCD) and the ion Berstein wave (IBW) heating in the HT-7 tokamak. More than 80% of the plasma current was sustained by the LHCD and the bootstrap current. Large edge pressure gradients were observed. The magnetohydrodynamic (MHD) instabilities were often driven to terminate the discharge or reduce the discharge performance, when the IBW resonant layer was near the rational surface. The resonant layer of the safety factor q = 2 is located at 0.6a with a = 27 cm being the minor radius. The width of magnetic island (the poloidal mode number m = 2) was about 2 cm. The plasma energy was reduced quickly by 30% by MHD instabilities. The behaviour of MHD instabilities is reported. A large sawtooth activity (m = 1) was observed before inducing MHD (m = 2).
(Magnetohydrodynamics (including electron magnetohydrodynamics))
引用本文:
MAO Jian-Shan;LUO Jia-Rong;SHEN Biao;ZHAO Jun-Yu;HU Li-Qun;ZHU Yu-Bao;XU Guo-Sheng; M. Asif;
GAO Xiang;WAN Bao-Nian. Observation of Magnetohydrodynamics Instabilities in Ion Berstein Wave and Lower-Hybrid-Current Driving Synergetic Discharges on HT-7 Tokamak[J]. 中国物理快报, 2004, 21(7): 1310-1313.
MAO Jian-Shan, LUO Jia-Rong, SHEN Biao, ZHAO Jun-Yu, HU Li-Qun, ZHU Yu-Bao, XU Guo-Sheng, M. Asif,
GAO Xiang, WAN Bao-Nian. Observation of Magnetohydrodynamics Instabilities in Ion Berstein Wave and Lower-Hybrid-Current Driving Synergetic Discharges on HT-7 Tokamak. Chin. Phys. Lett., 2004, 21(7): 1310-1313.
YANG Qing-Wei;ZHOU Hang-Yu;FENG Bei-Bin;LIU Yi;PAN Yu-Dong;LI Wei;DUAN Xu-Ru;CHEN Wei;CUI Zheng-Ying;JI Xiao-Quan;DING Xuan-Tong;HL-A team. A New Criterion for Disruption Prediction on HL-2A[J]. 中国物理快报, 2006, 23(4): 891-894.
2004, Vol. 21 
