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Related Experiment Video

Updated: Feb 19, 2026

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

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Ring-averaged ion velocity distribution function probe for laboratory magnetized plasma experiment.

Eiichirou Kawamori¹, Jinting Chen¹, Chiahsuan Lin¹

¹Institute of Space and Plasma Sciences, National Cheng Kung University, Tainan 70101, Taiwan.

The Review of Scientific Instruments

|November 3, 2017

Summary

A new diagnostic tool, the ring-averaged ion distribution function probe (RIDFP), measures ion velocity distribution in laboratory plasmas. This probe successfully characterized magnetized plasma, confirming a Maxwellian distribution.

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Area of Science:

Plasma Physics
Gyrokinetics
Diagnostic Techniques

Background:

The ring-averaged velocity distribution function of ions is crucial in gyrokinetic plasma physics.
Accurate measurement of this distribution is essential for understanding plasma behavior in laboratory settings.

Purpose of the Study:

To develop and validate a novel diagnostic tool for measuring the ring-averaged velocity distribution function of ions in laboratory magnetized plasmas.
To enable precise characterization of ion velocity distributions, crucial for gyrokinetic studies.

Main Methods:

Development of the ring-averaged ion distribution function probe (RIDFP), utilizing a set of ion collectors for velocity selection based on Larmor radii.
Implementation of an automated system to adjust the probe's electrostatic potential to match the plasma's space potential, nullifying sheath effects.
Deployment of the RIDFP in a laboratory magnetized plasma experiment.

Main Results:

The developed RIDFP successfully measured the equilibrium ring-averaged velocity distribution function of ions.
The measured distribution was found to be in accordance with a Maxwellian distribution.
The ion temperature of the laboratory magnetized plasma was determined to be 0.2 eV.

Conclusions:

The RIDFP is a successful diagnostic tool for measuring ion velocity distribution functions in laboratory plasmas.
The probe's ability to nullify sheath potential influence ensures accurate measurements.
The results validate the probe's capability to characterize plasma equilibrium properties.