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MARFE phenomena in the HT-7 tokamak

2000; Elsevier BV; Volume: 279; Issue: 2-3 Linguagem: Inglês

10.1016/s0022-3115(99)00287-1

1873-4820

Xiang Gao, J. R. Luo, Yan Zhao, N. Qiu, Y. X. Jie, Yong Yang, Chengyi Xia, Baonian Wan, G. L. Kuang, X.D Zhang, Jinguo Li, Fei Yin, X.N Liu, Xianzu Gong, S.Y Zhang, J. Y. Zhao, Lisha Hu, Ze Wu, Y.D Li, Kun Yang, Yi Bao, Wenhai Ye, Liang Chen, Heng‐Yu Fan, S.X Liu, Y.F Chen, Binbin Lin, Y.H Xu, Yuejiang Shi, Maoyong Song, Xiaoming Zhang, M. S. Wei, Min Zeng, Ai-Gen Xie, Ningzhuo Cui, Huailin Ruan, Liang Wang, Biao Sheng, S.C. Liu, Xin Tong, Xiang Gu, Jiangyu Mao, Jinbo Xie, Y. X. Wan,

Superconducting Materials and Applications

Multifaceted asymmetric radiation from the edge (MARFE) phenomena on the HT-7 superconducting tokamak are summarized in this paper. The best correlation has been found between the total input ohmic power and the product of the edge line average density and Zeff. The occurrence of MARFEs are strongly correlated with impurity density, and always occur at Zeff=3–8 ohmic discharges. In the HT-7 tokamak high Zeff discharges, it is found that the MARFEs usually occur at values of Zeff1/2ρ in the range of 0.5–0.7, where ρ=πa2ne/Ip (1020 MA−1 m−1). In the case of good wall condition (Zeff=1–2), the onset of MARFEs have not been observed before reaching the Greenwald density limit on the HT-7. Improved confinement mode induced by a MARFE is observed, and it is maintained for about 40 ms. MARFE cools the plasma edge, and the electron density profile is observed to become more narrow and peaked.