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Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas

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Inflection-point method of interpreting emissive probe characteristics.

J R Smith¹, N Hershkowitz, P Coakley

¹Department of Physics and Astronomy, The University of Iowa, Iowa City, Iowa 52242, USA.

The Review of Scientific Instruments

|February 1, 1979

Summary

Emissive Langmuir probes accurately measure plasma potential and electron temperature in multidipole plasmas. This method simplifies diagnostics by deriving key parameters from a single probe characteristic curve.

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Area of Science:

Plasma Physics
Diagnostic Techniques

Background:

Langmuir probes are essential for plasma characterization.
Emissive probes offer enhanced diagnostic capabilities.
Multidipole plasmas are relevant in various applications.

Purpose of the Study:

To investigate the utility of emissive Langmuir probes.
To determine plasma potential, electron temperature, and probe temperature from a single characteristic curve.
To analyze the impact of space-charge limiting and probe contamination.

Main Methods:

Utilizing emissive Langmuir probes in unmagnetized and weakly magnetized multidipole plasmas.
Analyzing the current-voltage characteristic curve of the probe.
Identifying the inflection point for plasma potential determination.

Main Results:

Plasma potential, electron temperature, and probe temperature can be determined from one probe characteristic curve.
The inflection point of the current-voltage curve accurately yields plasma potential (within the order of probe temperature Tw/e for weak emission).
The study presents the effects of space-charge limiting and probe contamination on measurements.

Conclusions:

Emissive Langmuir probes provide a simplified and effective method for plasma diagnostics.
The technique is suitable for unmagnetized and weakly magnetized multidipole plasmas.
Understanding space-charge effects and contamination is crucial for accurate measurements.