Abstract

The shape is analyzed of the electron temperature profiles measured in experiments on the axial ECR heating at the L-2M stellarator at different densities and heating powers. It is ascertained that when the reduced ECR heating power exceeds some threshold value, the electron temperature profiles become broadened and flat in the core region of the plasma column. The correlation is revealed between the appearances of the flat temperature profiles and the density profiles with a dip in the axial region (the dip-shaped profiles) occurring as a result of the density pump-out effect. It is concluded that the appearance of the dip-shaped density profiles in the plasma results in a change in the mechanism of microwave radiation absorption. Hypothetically, the cyclotron absorption of the electron Bernstein waves becomes the dominant mechanism for the microwave radiation absorption that, in turn, results in the formation of the broad and flat (in the core region) electron temperature profiles.

中文翻译：

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在L-2M恒星发生器的轴向ECR等离子加热条件下形成的电子温度曲线

摘要

分析了在不同密度和加热功率下在L-2M恒压机上轴向ECR加热实验中测得的电子温度曲线的形状。可以确定的是，当降低的ECR加热功率超过某个阈值时，电子温度曲线在等离子柱的核心区域变宽且变平。揭示了在平坦温度曲线的出现与密度曲线之间的相关性，其中由于密度抽出效应而在轴向区域出现了凹陷（凹陷形状的曲线）。可以得出结论，等离子体中浸没形密度分布的出现导致微波辐射吸收机理的改变。假设地，