Numerical Study of Non-Linear Effects for a Swept Bias Langmuir Probe

We present a numerical study disclosing non-linear effects and hysteresis loops for a swept bias Langmuir probe. A full kinetic particle in cell (PIC) model has been used to study the temporal sheath effects and the probe current. Langmuir probes are normally operated at low frequencies, since a &qu...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2022-05, Vol.50 (5), p.1237-1245
Main Authors: Kjolerbakken, Kai Morgan, Miloch, Wojciech J., Martinsen, Orjan Grottem, Pabst, Oliver, Roed, Ketil
Format: Article
Language:eng ; nor
Subjects:
Bias
Capacitance
Electric potential
Electron density
Hysteresis loops
Ions
Langmuir probes
Memristors
plasma
Plasma temperature
Plasmas
Probes
Sheaths
Time-frequency analysis
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Summary:We present a numerical study disclosing non-linear effects and hysteresis loops for a swept bias Langmuir probe. A full kinetic particle in cell (PIC) model has been used to study the temporal sheath effects and the probe current. Langmuir probes are normally operated at low frequencies, since a "close to steady state" condition is required to characterize the plasma. However, during operations above frequencies normally used, capacitive and non-linear resistive effects are being unveiled. We demonstrate how ion and electron density and temperature change properties of the probe-plasma system. We also show that a swept Langmuir probe exhibits essential properties described as the "fingerprint of memristors" and how a Langmuir probe can be identified as a transversal memristor. Understanding non-linear processes might enable new ways to operate Langmuir probes with higher sampling rates and better accuracy.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2022.3164220