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A model for non-local electron heat transport

机译：非局部电子传热模型

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Microphysically, the electromagnetic electron temperature gradient (ETG) mode is studied within the framework of electron magnetohydrodynamics (EMHD). It is discovered that the dominant electromagnetic ETG instability in the core regime of low density plasma is a short-wavelength one. The instability-induced turbulent heating makes the core electron temperature (T_e) to rise. The condition for the core T_e rise in low density plasma, obtained from the ETG instability, is consistent with the experimental observation qualitatively. Furthermore, the electromagnetic ETG instability in high density plasma is also studied and compared with the experimental results. Macrophysically, a global energy balance equation is extended to tokamak plasma from a reversed pinch one. From the equation it is shown that the edge heat pulse weakens the core T_e rise or even makes the non-local effect disappear, one phenomenon observed in experiments. Accordingly, the macro-parameter condition for the core T_e rise is obtained. Finally, the analyses of electron heat transport coefficient indicate that when the core T_e rises in response to the edge cold pulse, the heat transport coefficient reduces largely due to the excited short-wavelength electromagnetic ETG turbulence in low density plasma.
机译：从微观上讲，在电子磁流体动力学（EMHD）框架内研究了电磁电子温度梯度（ETG）模式。发现在低密度等离子体的核心状态中占主导地位的电磁ETG不稳定性是短波长的。不稳定引起的湍流加热使芯电子温度（T_e）升高。由ETG的不稳定性所获得的低密度等离子体中的岩心T_e升高的条件在质量上与实验观察相符。此外，还研究了高密度等离子体中的电磁ETG不稳定性并将其与实验结果进行了比较。从宏观上讲，全局能量平衡方程式从反向捏合方程扩展到托卡马克等离子体。从方程中可以看出，边缘热脉冲减弱了铁心T_e的上升，甚至使非局部效应消失，这是实验中观察到的一种现象。因此，获得了芯T_e上升的宏参数条件。最后，电子传热系数的分析表明，当铁芯T_e响应于边缘冷脉冲而上升时，由于低密度等离子体中激发的短波长电磁ETG湍流，传热系数大大降低。

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