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

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

Published on: May 25, 2021

Ion-temperature determination with a baffled Langmuir probe.

S M Finnegan¹, M E Koepke², V I Demidov²

¹Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

The Review of Scientific Instruments

|April 6, 2021

Summary

This study introduces a novel baffled Langmuir probe for real-time plasma diagnostics. The probe allows for adjustable electron and ion current ratios, enabling accurate measurements of space potential and ion temperature in magnetized plasmas.

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Area of Science:

Plasma Physics
Diagnostic Techniques

Background:

Langmuir probes are essential for plasma characterization.
Measuring plasma parameters in magnetized environments presents challenges.
Existing methods may lack real-time capabilities or accuracy.

Purpose of the Study:

To develop and validate a modified Langmuir probe for enhanced plasma measurements.
To enable real-time determination of space potential and ion temperature.
To investigate the effect of probe geometry on plasma current collection.

Main Methods:

Utilized a tungsten wire Langmuir probe with adjustable ceramic baffles in a barium Q-machine plasma.
Oriented the probe perpendicular to the magnetic field (B).
Varied the azimuthal orientation of baffle slots to control electron and ion access to the sensor.

Main Results:

Adjustable electron (I_e^sat) and ion (I_i^sat) saturation currents achieved by altering baffle orientation without changing probe bias voltage (V_b).
Accurate real-time space potential (V_s) measurements obtained with optimal shielding (I_e^sat/I_i^sat=1).
Accurate real-time ion temperature (T_i) measurements obtained with maximal shielding (I_e^sat/I_i^sat≪1).

Conclusions:

The baffled Langmuir probe provides a versatile tool for real-time plasma diagnostics.
Differential floating potential measurements between optimally and maximally shielded configurations yield ion temperature and fluctuation phase.
This technique enhances the capability for in-situ plasma parameter determination.