中国物理B ›› 2009, Vol. 18 ›› Issue (3): 1153-1160.doi: 10.1088/1674-1056/18/3/052

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Electron temperature fluctuation in the HT-7 Tokamak plasma observed by electron cyclotron emission imaging

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   

  1. (1)Chinese Academy of Sciences (CAS) Key Laboratory of Plasma Physics, Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China; (2)Department of Applied Science, University of California, Davis CA 95616, USA; (3)Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
  • 收稿日期:2008-06-07 修回日期:2008-08-25 出版日期:2009-03-20 发布日期:2009-03-20
  • 基金资助:
    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

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)   

  1. 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; c Department of Applied Science, University of California, Davis CA 95616, USA
  • Received:2008-06-07 Revised:2008-08-25 Online:2009-03-20 Published:2009-03-20
  • Supported by:
    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

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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.

关键词: electron temperature fluctuation, electron cyclotron emission imaging, Tokamak

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.

Key words: electron temperature fluctuation, electron cyclotron emission imaging, Tokamak

中图分类号:  (Tokamaks, spherical tokamaks)

  • 52.55.Fa
52.25.Gj (Fluctuation and chaos phenomena) 52.35.Kt (Drift waves) 52.70.-m (Plasma diagnostic techniques and instrumentation) 52.25.Fi (Transport properties)