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

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Time-dependent Tonks-Langmuir model is unstable.

T E Sheridan¹, S D Baalrud²

¹Department of Physics and Astronomy, Ohio Northern University, Ada, Ohio 45810 USA.

Physical Review. E

|January 20, 2018

Summary

This summary is machine-generated.

We found unstable ion waves in a plasma discharge simulation. These low-frequency waves move toward the boundary, destabilized by the electric field.

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Area of Science:

Plasma Physics
Computational Physics

Background:

The Tonks-Langmuir model describes plasma discharges.
Understanding plasma wave dynamics is crucial for various applications.

Purpose of the Study:

To investigate a time-dependent extension of the Tonks-Langmuir model.
To analyze the behavior of ions and electron dynamics in a 1D plasma discharge.

Main Methods:

Particle-in-cell (PIC) simulation was employed.
Linear kinetic theory was used for analysis.

Main Results:

Coherent, low-frequency, long-wavelength unstable ion waves were observed.
Wave propagation speed was below ion acoustic speed and average ion velocity.
Maximum wave potential amplitude reached ≈0.09T_{e} near the boundary.

Conclusions:

The observed instability was identified as slow ion-acoustic wave modes.
The zero-order electric field was found to destabilize these wave modes.