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首页> 外文期刊>Physics of plasmas >Zero bias emission current in laser heated emissive probe and proper choice of probe-tipmaterial
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Zero bias emission current in laser heated emissive probe and proper choice of probe-tipmaterial

机译：激光加热发射探头的零偏置电流和正确选择探针倾斜

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摘要

Emissive probes are considered as one of the best diagnostic tools for the direct measurement of plasma potential in low temperature plasma systems. Laser-heated emissive probes (LHEPs), due to their higher lifetime, are becoming more popular than their current-heated conventional counterparts. Graphite due to its higher absorption coefficient at CO2 laser wavelength and LaB6 due to its lower work function are commonly used as the probe materials for laser heated probes. Experiments with a probe-tip made of a graphite material have revealed that the emission processes other than thermionic emission also occur on heating the material with the laser, which can affect the plasma potential measurements and change the I-V characteristics of the LHEP. This additional emission due to the laser irradiation on the graphite-tip explains the measurements of lower values of plasma potentials and also describes the observation of an increase in electron saturation current with the increase in thermionic emission current due to heating. The possible mechanisms of this negatively charged-emission other than the thermionic emission from the graphite-tip have been thoroughly characterized in the absence of plasma. This extra emission is not observed in the probe-tip made up of LaB6, and a good comparison of I-V characteristics could be established with a conventional filament emissive probe in the case of LaB6.
机译：发光探针被认为是直接测量低温等离子体系统中等离子体电位的最佳诊断工具之一。由于其寿命更高，激光加热的发光探针（LHEP）越来越受其电流加热的传统对应物的流行。由于其在CO2激光波长和Lab6而导致的石墨，由于其较低的功函数，通常用作激光加热探针的探针材料。具有由石墨材料制成的探针尖端的实验表明，除热量发射之外的发射过程也会发生在加热与激光器的加热材料上，这会影响等离子体电位测量并改变LHEP的I-V特征。由于石墨尖端上的激光照射引起的这种额外发射说明了等离子体电位较低值的测量，并且还描述了由于加热而增加的电子饱和电流增加的观察。除了石墨尖端的热离子发射之外的这种带负电荷发射的可能机制已经在不存在血浆的情况下彻底表征。在Lab6组成的探针尖端中未观察到这种额外的发射，并且可以在Lab6的情况下使用传统的灯丝发射探针建立I-V特性的良好比较。

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  • 来源
    《Physics of plasmas》 |2019年第5期|共8页
  • 作者

    Pandit P.; Sarma A.; Ghosh J.; Kella Vara Prasad; Ramaiya N.; Manchanda R.; Pandya Santosh; Chowdhuri M. B.; John P. I.;

  • 作者单位

    Inst Adv Res Gandhinagar 382426 Gujarat India;

    VIT Univ Chennai Sch Adv Sci Vandalur Kelambakkam Rd Chennai 600127 Tamil Nadu India;

    Inst Plasma Res Gandhinagar 382428 Gujarat India;

    Inst Adv Res Gandhinagar 382426 Gujarat India;

    Inst Plasma Res Gandhinagar 382428 Gujarat India;

    Inst Plasma Res Gandhinagar 382428 Gujarat India;

    Inst Plasma Res Gandhinagar 382428 Gujarat India;

    Inst Plasma Res Gandhinagar 382428 Gujarat India;

    Inst Plasma Res Gandhinagar 382428 Gujarat India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 等离子体物理学;
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