Correlation Between Fluctuating Electron Temperature and Fluctuating Space-Potential Challenges the Probe Determination of Turbulent Electric Field Spectrum

The measurement of plasma potential and electric field by the traditional Langmuir probe method can contain a significant qualitative error due to a spurious effect from temperature fluctuations that appear in the temperature-potential cross phase. This error is separate from any systematic error in...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2024-04, Vol.52 (4), p.1162-1167
Main Authors: Yuan, Chengxun, Zhou, Chen, Demidov, Mikhail V., Gyergyek, Tomaz, Kovacic, Jernej, Koepke, Mark E., Kurlyandskaya, Iya P., Demidov, Vladimir I., Costea, Stefan, Zhou, Zhongxiang
Format: Article
Language:English
Subjects:
Amplitudes
Electric fields
Electric potential
Electric probe
Electron energy
electron temperature oscillations
emissive probes (EPs)
Fluctuations
Magnetic field measurement
magnetized plasma
Plasma measurements
plasma potential oscillations
Plasmas
Probes
Systematic errors
Temperature measurement
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Summary:The measurement of plasma potential and electric field by the traditional Langmuir probe method can contain a significant qualitative error due to a spurious effect from temperature fluctuations that appear in the temperature-potential cross phase. This error is separate from any systematic error in the floating potential amplitude due to cross-correlated temperature and potential fluctuations not averaging out. Conditions under which electron temperature fluctuations significantly and insignificantly affect the measurement of electric field fluctuations in plasma are considered for both effects. Actual measurements illustrate the obtained conclusions are presented. Correct direct measurement of plasma's space potential fluctuations requires that the amplitude of electron temperature fluctuations (in eV) be at least ten times smaller than the space potential fluctuation amplitude (in volts).
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2023.3337008