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Anisotropic electron velocity distribution in an ECR helium plasma as determined from polarization of emission lines

机译:由发射线的极化确定的ECR氦等离子体中的各向异性电子速度分布

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摘要

A helium plasma is produced by electron-cyclotron resonance heating in a cusp-configuration magnetic field. Several neutral helium lines are found polarized in the direction perpendicular to the magnetic field; the maximum polarization degree exceeds 10%. The polarization degree and intensity of the emission lines yield, respectively, the alignment and population of the upper levels. The population-alignment collisional-radiative model is developed, and the experimental result is interpreted in terms of an anisotropic electron velocity distribution; it is of a Saturn-type with the central thermal component of 14 eV and the 'ring' component displaced by 9.2 eV from the central component. The relative number of 'ring' electrons is 40%.
机译:氦等离子体是通过在尖端结构的磁场中通过电子回旋共振加热而产生的。发现有几条中性氦线在垂直于磁场的方向上极化。最大偏振度超过10%。发射线的偏振度和强度分别产生较高能级的排列和填充。建立了种群取向碰撞辐射模型,并根据各向异性电子速度分布解释了实验结果。它是土星型,中心热成分为14 eV,“环”成分与中心成分相距9.2 eV。 “环”电子的相对数量为40%。

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