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Energy distribution functions of kilovolt ions in a modified Penning discharge

机译:改进的Penning放电中千伏离子的能量分布函数

摘要

The distribution function of ion energy parallel to the magnetic field of a Penning discharge was measured with a retarding potential energy analyzer. Simultaneous measurements of the ion energy distribution function perpendicular to the magnetic field were made with a charge-exchange neutral detector. The ion energy distribution functions are approximately Maxwellian, and their kinetic temperatures are equal within experimental error. This suggests that turbulent processes previously observed Maxwellianize the velocity distribution along a radius in velocity space, and result in an isotropic energy distribution. The kinetic temperatures are on the order of kilovolts, and the tails of the ion energy distribution functions are Maxwellian up to a factor of 7 e-folds in energy. When the distributions depart from Maxwellian, they are enhanced above the Maxwellian tail. Above densities of about 10 to the 10th power particles/cc, this enhancement appears to be the result of a second, higher temperature Maxwellian distribution. At these high particle energies, only the ions perpendicular to the magnetic field lines were investigated.
机译:用延迟势能分析仪测量与潘宁放电的磁场平行的离子能量的分布函数。用电荷交换中性检测器同时测量垂直于磁场的离子能量分布函数。离子能量分布函数近似为Maxwellian,其动力学温度在实验误差范围内相等。这表明先前观察到的湍流过程使麦克斯韦化沿速度空间中的半径沿速度分布,并导致各向同性的能量分布。动能温度约为千伏,离子能量分布函数的尾部为麦克斯韦式,能量可达7 e倍。当分布偏离麦克斯韦式时,它们会在麦克斯韦式尾部上方增强。高于约10到第十功率粒子/ cc的密度,这种增强似乎是第二次更高的麦克斯韦分布的结果。在这些高粒子能量下,仅研究垂直于磁场线的离子。

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    Roth J. R.;

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  • 年度 1972
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