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首页> 外文期刊>Journal of Applied Physics >Assessment of Focused Microwave Systems for Plasma Diagnostics Against Electrostatic Probes
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Assessment of Focused Microwave Systems for Plasma Diagnostics Against Electrostatic Probes

机译:聚焦微波系统对静电探针进行等离子体诊断的评估

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摘要

A simplified approach in the use of focused microwave systems for the investigation of radially varying plasmas is assessed by comparison to electrostatic probes on a dc arc argon jet. The approach consists in the mathematical inversion into a radial electron density distribution, of a fit to the phase shift profile obtained by scanning a focused interferometer across a cylindrical plasma. A close fit given by Bockasten's coefficient method, and a loose fit utilizing a modified Gaussian, are considered. The assessment covers a wide range of radial refractive index gradients (as large as 0.4/cm) with electron density up to critical on axis. The modified Gaussian fit approach shows a maximum disagreement of 25% relative to the probe results for an impact parameter smaller than 0.5 and of 350% across the plasma jet. A simple modification to the method would apparently permit the reduction of the overall discrepancy to less than 30%. The close fit is found to yield discrepancies which are worse by a factor of 2–3.
机译:通过与直流电弧氩射流上的静电探头进行比较,可以评估使用聚焦微波系统研究径向变化等离子体的简化方法。该方法包括数学上转换为径向电子密度分布,该径向电子密度分布与通过在圆柱形等离子体上扫描聚焦干涉仪而获得的相移曲线相适应。考虑了由博克斯坦系数法给出的紧密拟合和利用改进的高斯拟合的松散拟合。该评估涵盖了范围广泛的径向折射率梯度(最大为0.4 / cm),并且电子密度高达轴上的临界值。修改后的高斯拟合方法显示,对于小于0.5的冲击参数,相对于探针结果的最大差异为25%,而在整个等离子流中,则为350%。对方法的简单修改显然可以使总体差异减少到小于30%。发现紧密拟合会产生差异,差异会增加2-3倍。

著录项

  • 来源
    《Journal of Applied Physics》 |1969年第10期|共12页
  • 作者

    Richard C.; Carswell A. I.;

  • 作者单位

    RCA Limited, Research Laboratories, Montreal, Quebec, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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