Abstract

The electron energy distribution functions that form in the plasma heating region were recovered from data on the soft X-ray spectra in the energy range of 2−20 keV. The spectra were measured at the L-2M stellarator in the regime of electron cyclotron resonance (ECR) heating in two experiments: on the axial ECR heating (the heating power was P_ECRH = 250 kW, the electron density was n_e = 1.9 × 10¹⁹ m^–3, and the electron temperature was T_e = 0.74 keV) and the off-axial ECR heating (P_ECRH = 350 kW, n_e = 2.5 × 10¹⁹ m^–3, and T_e = 0.7 keV). It was shown that in both experiments the electron energy distribution functions are not Maxwellian and that considerable ensembles of suprathermal electrons form in the heating regions.

中文翻译：

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L-2M仿星器大功率ECR等离子体加热条件下电子能量分布函数的恢复

摘要

从 2-20 keV 能量范围内的软 X 射线光谱数据中恢复了在等离子体加热区域中形成的电子能量分布函数。在两个实验中，在电子回旋共振 (ECR) 加热机制下在 L-2M 仿星器上测量光谱：在轴向 ECR 加热上（加热功率为P _ECRH = 250 kW，电子密度为n _e = 1.9 × 10 ¹⁹ m ^–3 , 电子温度为T _e = 0.74 keV) 和_离轴ECR 加热 ( P _ECRH = 350 kW, n _e = 2.5 × 10 ¹⁹ m ^–3 , T_e = 0.7 keV）。结果表明，在两个实验中，电子能量分布函数都不是麦克斯韦分布函数，并且在加热区域形成了相当多的超热电子集合。