中国物理B ›› 2009, Vol. 18 ›› Issue (3): 1153-1160.doi: 10.1088/1674-1056/18/3/052
徐小圆1, 王俊1, 余弈1, 闻一之1, 俞昌旋1, 刘万东1, N. C. Luhmann2, C. W. Domier2, 王剑2, 夏正刚2, 申作玮2, 万宝年3, 高翔3
Xu Xiao-Yuan(徐小圆)a)†, Wang Jun(王俊)a), Yu Yi(余弈)a), Wen Yi-Zhi(闻一之)a), Yu Chang-Xuan(俞昌旋)a), Liu Wan-Dong(刘万东)a), Wan Bao-Nian(万宝年)b), Gao Xiang(高翔)b), N. C. Luhmannc), C. W. Domierc), Jian Wang(王剑)c), Z. G. Xia(夏正刚)c), and Zuowei Shen(申作玮)c)
摘要: The fluctuation of the electron temperature has been measured by using the electron cyclotron emission imaging in the Hefei Tokamak-7 (HT-7) plasma. The electron temperature fluctuation with a broadband spectrum shows that it propagates in the electron diamagnetic drift direction, and the mean poloidal wave-number $\bar{k}_{\theta}$ is calculated to be about 1.58 cm-1, or \bar{k}θ ρs≈ 0.34. It indicates that the fluctuation should come from the electron drift wave turbulence. The linear global scaling of the electron temperature fluctuation with the gradient of electron temperature is consistent with the mixing length scale qualitatively. Evolution of spectrum of the fluctuation during the sawtooth oscillation phases is investigated, and the fluctuation is found to increase with the gradient of electron temperature increasing during most phases of the sawtooth oscillation. The results indicate that the electron temperature gradient is probably the driver of the fluctuation enhancement. The steady heat flux driven by electron temperature fluctuation is estimated and compared with the results from power balance estimation.
中图分类号: (Tokamaks, spherical tokamaks)