Electron temperature fluctuation in the HT-7 tokamak plasma observed by electron cyclotron emission imaging
Electron temperature fluctuation in the HT-7 tokamak plasma observed by electron cyclotron emission imaging
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DOI：
10.1088/1674-1056/18/3/052
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发表时间：
2009-03
影响因子：
1.7
通讯作者：
Xu Xiaoyuan;Wang Jun;Y. Yi;Wen Yi-Zhi;Yu Changxuan;Liu Wandong;Wan Baonian;Gao Xiang;N. Luhman
中科院分区：
文献类型：
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作者：
Xu Xiaoyuan;Wang Jun;Y. Yi;Wen Yi-Zhi;Yu Changxuan;Liu Wandong;Wan Baonian;Gao Xiang;N. Luhman
用电子回旋发射成像法测量了合肥托卡马克-7(HT-7)等离子体中电子温度的涨落。宽带谱的电子温度涨落表明它沿电子反磁漂移方向传播，并计算出平均极向波数θ约为1.5 8 cm−1，或θρS≈0.34。结果表明，涨落应来自电子漂移波湍流。电子温度涨落随电子温度梯度的线性全局标度与混合长度标度定性一致。研究了锯齿波振荡阶段涨落频谱的演化，发现在锯齿波振荡的大部分阶段，涨落都随着电子温度梯度的升高而增大。结果表明，电子温度梯度可能是涨落增强的驱动因素。对电子温度波动驱动的稳态热流密度进行了估算，并与功率平衡估算结果进行了比较。
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 θ is calculated to be about 1.58 cm−1, or θρs ≈ 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.