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Indirect determination of the electric field in plasma discharges using laser-induced fluorescence spectroscopy

机译:使用激光诱导荧光光谱法间接测定等离子体放电中的电场

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摘要

The evaluation of electric fields is of prime interest for the description of plasma characteristics. In this work, different methods for determining the electric field profile in low-pressure discharges using one-and two-dimensional Laser-Induced Fluorescence (LIF) measurements are presented and discussed. The energy conservation, fluid, and kinetic approaches appear to be well-suited for the electric field evaluation in this region of the plasma flow. However, the numerical complexity of a two-dimensional kinetic model is penalizing due to the limited signal-to-noise ratio that can be achieved, making the computation of the electric field subject to large error bars. The ionization contribution which appears in the fluid model makes it unattractive on an experimental viewpoint. The energy conservation and 1D1V kinetic approaches should therefore be preferred for the determination of the electric field when LIF data are used. (C) 2014 AIP Publishing LLC.
机译:电场的评估对于描述等离子体特性至关重要。在这项工作中,提出并讨论了使用一维和二维激光诱导荧光(LIF)测量来确定低压放电中的电场分布的不同方法。节能,流体和动力学方法似乎非常适合在等离子流区域中的电场评估。但是,二维动力学模型的数值复杂性由于可以实现的有限的信噪比而受到不利影响,从而使电场的计算受到较大的误差线的限制。在实验模型中,出现在流体模型中的电离作用使其没有吸引力。因此,在使用LIF数据时,应优先选择节能和1D1V动力学方法来确定电场。 (C)2014 AIP Publishing LLC。

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