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Investigation of lower hybrid current drive during H-mode in EAST tokamak |
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| Authors: | Li Miao-Hui Ding Bo-Jiang Kong Er-Hu Zhang Lei Zhang Xin-Jun Qian Jin-Ping Yan Ning Han Xiao-Feng Shan Jia-Fang Liu Fu-Kun Wang Mao Xu Han-Dong and Wan Bao-Nian |
| Institution: | Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China |
| Abstract: | H-mode discharges with lower hybrid current drive (LHCD) alone are achieved in EAST divertor plasma over a wide parameter range. These H-mode discharges are characterized by a sudden drop in Dα emission and a spontaneous rise in main plasma density. Good lower hybrid (LH) coupling during H-mode is obtained by putting the plasma close to the antenna and by injecting D2 gas from a pipe near the grill mouse. The analysis of lower hybrid current drive properties shows that the LH deposition profile shifts off axis during H-mode, and current drive (CD) efficiency decreases due to the increase in density. Modeling results of H-mode discharges with a general ray tracing code GENRAY are reported. |
| Keywords: | H-mode edge localized mode lower hybrid current drive |
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