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首页> 外文期刊>Physics of plasmas >Sheath characteristics in a magnetically filtered low density low temperature multicomponent plasma with negative ions
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Sheath characteristics in a magnetically filtered low density low temperature multicomponent plasma with negative ions

机译：磁过滤低密度低温多组分等离子体的鞘特性，具有负离子

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摘要

Negative ion rich multicomponent plasma is produced in a novel plasma device for sheath studies. The experimental volume is composed of low electron temperature (Te similar to 0.2-0.4 eV) and low electron density (ne similar to 105-106 cm-3) argon (Ar) plasma with negative ions. Negative ions are introduced in the argon plasma by injecting sulfur hexafluoride (SF6) gas. Plasma parameters in the device are tunable, very close to the ionospheric plasma conditions specific to the D-region. A magnetic filter is used, which allows selective diffusion of low energy electrons and ions from a DC discharge source. Positive ion and electron/negative ion sheaths formed in front of a biased metal plate are investigated using an emissive probe. Both the positive ion and electron/negative ion sheaths are found to be of similar thickness and symmetric structure. With an enhanced negative ion concentration, the sheath thickness is found to decrease. Poisson's equation is derived considering the electrons as Maxwellian. The experimental results closely follow the prediction of Poisson's equation and the Debye sheath model. Sheath studies as shown here, for laboratory plasmas with near-ionospheric parameters, are important for the understanding of spacecraft-to-plasma interactions and for the design of ionospheric instrumentation. Published under license by AIP Publishing.
机译：在用于护套研究的新型等离子体装置中产生负离子富含的多组分等离子体。实验体积由低电子温度（TE类似于0.2-0.4eV）和具有负离子的低电子密度（类似于105-106cm-3）氩（Ar）血浆的氩气（Ar）血浆组成。通过注射六氟化硫化物（SF6）气体，在氩等离子体中引入负离子。装置中的等离子体参数是可调谐的，非常接近D区特异性的电离层等离子体条件。使用磁性滤波器，其允许从DC放电源的低能量电子和离子的选择性扩散。使用发光探针研究形成在偏置金属板前面的正离子和电子/负离子护套。发现正离子和电子/负离子护套都是相似的厚度和对称结构。通过增强的负离子浓度，发现鞘厚度降低。考虑到Maxwellian的电子，推导出泊松等式。实验结果紧密遵循泊松等式的预测和德义鞘模型。鞘研究如图所示，对于具有近电离层参数的实验室等离子体，对理解航天器对等离子体相互作用和电离层仪器设计是重要的。通过AIP发布在许可证下发布。

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