In saturated Ohmic confinement regime of the experimental advanced superconducting tokamak, significant changes in the relative electron temperature fluctuations ${\tilde{T}}_e/{\overline{T}}_e$, measured by a correlation electron cyclotron emission system, have been observed. It was found that ${\tilde{T}}_e/{\overline{T}}_e$ is strongly dependent on the normalized electron temperature and density gradient, $R/L_{T_e}=R\left|\nabla T_e\right|/T_e$ and $R/L_{n_e}=R\left|\nabla n_e\right|/n_e$. ${\tilde{T}}_e/{\overline{T}}_e$ stay at a high level when $R/L_{T_e}$ is within the range of $17-25$ and $R/L_{n_e}$ is within the range of $4-6$. It has been also observed that the energy confinement degradation is correlated with the increase in electron temperature fluctuations. The linear stability analysis results show that the electron temperature fluctuations are mainly attributed to the ion temperature gradient modes.

中文翻译：

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与 EAST 欧姆等离子体中的能量限制退化相关的电子温度波动

在实验先进超导托卡马克的饱和欧姆限制状态下，相对电子温度波动的显着变化 ${\widetilde{吨}}_{\mathrm{电子}}/{\overline{吨}}_{\mathrm{电子}}$，由相关电子回旋发射系统测量，已被观察到。结果发现${\widetilde{吨}}_{\mathrm{电子}}/{\overline{吨}}_{\mathrm{电子}}$ 强烈依赖于归一化的电子温度和密度梯度， $\mathrm{电阻}/{升}_{{吨}_{\mathrm{电子}}}=\mathrm{电阻}\left|\nabla {吨}_{\mathrm{电子}}\right|/{吨}_{\mathrm{电子}}$ 和 $\mathrm{电阻}/{升}_{n_{\mathrm{电子}}}=\mathrm{电阻}\left|\nabla n_{\mathrm{电子}}\right|/n_{\mathrm{电子}}$. ${\widetilde{吨}}_{\mathrm{电子}}/{\overline{吨}}_{\mathrm{电子}}$ 保持高水平时 $\mathrm{电阻}/{升}_{{吨}_{\mathrm{电子}}}$ 在范围内 $17-25$ 和 $\mathrm{电阻}/{升}_{n_{\mathrm{电子}}}$ 在范围内 $4-6$. 还观察到能量限制退化与电子温度波动的增加相关。线性稳定性分析结果表明，电子温度波动主要归因于离子温度梯度模式。