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Brian Beal¹, Lee Johnson, Daniel Brown

¹Air Force Research Laboratory, 1 Ara Rd., Edwards Air Force Base, California 93524, USA. brian.beal@edwards.af.mil

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Summary

This summary is machine-generated.

A new double Langmuir probe method accurately measures plasma density and electron temperature. This versatile technique accounts for sheath expansion, making it ideal for various plasma conditions and Hall thruster applications.

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Area of Science:

Plasma Physics
Diagnostic Techniques

Background:

Accurate plasma characterization is crucial for understanding and optimizing plasma devices.
Traditional Langmuir probe methods often face limitations with sheath expansion and probe size constraints.

Purpose of the Study:

To develop a versatile double Langmuir probe technique for precise plasma density and electron temperature measurements.
To overcome limitations of existing methods by incorporating analytical fits for ion current collection.

Main Methods:

Developed a double Langmuir probe technique using analytical fits to Laframboise's numerical results.
Derived coupled equations relating electrode potential, plasma potential, and probe current to applied voltage.
Employed numerical techniques to solve equations and determine plasma parameters.

Main Results:

Successfully determined electron temperature and plasma density by solving derived equations.
The method self-consistently accounts for sheath expansion effects.
Applied to xenon plasma in a Hall thruster, yielding densities of 1 × 10^12–1 × 10^17 m⁻³ and electron temperatures of 0.5–5.0 eV.

Conclusions:

The developed double Langmuir probe technique offers a versatile and accurate method for plasma diagnostics.
It is applicable to a wide range of plasma densities and low ion temperatures without strict probe dimension requirements.
Validated through experimental measurements in a Hall thruster plume.