Electron temperature fluctuation in the HT-7 Tokamak plasma observed by electron cyclotron emission imaging
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)
a Chinese Academy of Sciences (CAS) Key Laboratory of Plasma Physics, Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China; b Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China; cDepartment of Applied Science, University of California, Davis CA 95616, USA
Abstract 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 $\bar{k}_{\theta\rho s}$ ≈ 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.
Received: 07 June 2008
Revised: 25 August 2008
Accepted manuscript online:
Fund: Project supported by
the National Natural Science Foundation of China (Grant No
10335060), PRC--US Fusion Cooperation Program (Plasma Physics,
Project A--5), and Chinese Academy of Sciences and Japanese Society
of Promotion of Science (CAS-JSPS) Core Univ
Cite this article:
Xu Xiao-Yuan(徐小圆), Wang Jun(王俊), Yu Yi(余弈), Wen Yi-Zhi(闻一之), Yu Chang-Xuan(俞昌旋), Liu Wan-Dong(刘万东), Wan Bao-Nian(万宝年), Gao Xiang(高翔), N. C. Luhmann, C. W. Domier, Jian Wang(王剑), Z. G. Xia(夏正刚), and Zuowei Shen(申作玮) Electron temperature fluctuation in the HT-7 Tokamak plasma observed by electron cyclotron emission imaging 2009 Chin. Phys. B 18 1153
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