Increasing the Measurement Range of Plasma Electron Parameters in the Single Langmuir Probe Method

Andreev, Sergey; Bernatskiy, A. V.; Очкин, В. Н.

doi:10.3103/s1068335620100024

Cited by 6 publications

(6 citation statements)

References 9 publications

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“…A new approach was used [11,12,15] to the formation of the IVC of the probe circuit when voltage is applied to the probe in the form of a combination of periodic and noise signals. This type of signal makes it possible to reduce the errors in determining the EEDF significantly in comparison with the use of only traditional periodic (sawtooth, sinusoidal, etc) signal forms.…”

Section: Methodsmentioning

confidence: 99%

“…The IVCs obtained during the experiment were processed by the Savitzky-Golay algorithm [28] to determine the EEDF [11,12,15]. During measurements, an array of IVCs was recorded, usually consisting of 256 dependences.…”

Section: Methodsmentioning

confidence: 99%

“…The final form of the EEDF and plasma parameters was determined by averaging the obtained data in the array. The values of the standard deviations of the measured parameters and the EEDF error were determined [11,12,15].…”

Section: Methodsmentioning

confidence: 99%

“…Before the next recording of the IVC array, a voltage of −200 V was applied to each probe [11,12,15]. This operation led to the cleaning of the probe surface [29,30].…”

Section: Methodsmentioning

confidence: 99%

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Electron sink on the Langmuir probe in plasma, its influence on measurements and methods to account for it

Andreev¹,

Bernatskiy²,

Dyatko³

et al. 2021

Plasma Sources Sci. Technol.

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The influence of the electron sink effect on the probe on the results of measurements of the electron energy distribution functions (EEDFs), plasma potential, and electron concentration was studied. The studies were carried out for helium in a discharge with a hollow cathode at a gas pressure of 1 Torr for cathode-anode distances of 1 cm and 3 cm; measurements were carried out at several distances from the cathode. The distribution functions were obtained by processing the probe volt-ampere characteristics using the standard Druyvesteyn method. The form of the measured EEDFs changed with distance from the cathode. According to test calculations performed using the Monte Carlo method, this was due to the nonlocal nature of the EEDF formation under the considered conditions. Calculations also showed that the nonlocality effect manifests itself mainly in the region of the high-energy part of the EEDF, while in the low-energy region the form of the EEDF is close to local one. The latter fact was used to correct the measured EEDFs with allowance for the effect of electron sinking to the probe. In standard probe measurements, the sink (flux, flow) of electrons to the probe leads to underestimated values of the EEDFs in the region of low electron energies. The paper analyzes various known methods (formulas) for calculating the amount of sink in relation to the experimental conditions under consideration. The correction of the measured EEDFs was carried out taking into account the indicated effect. The errors in determining the macroscopic parameters of the plasma and the rates of elementary processes using the EEDFs obtained by processing the probe characteristics without taking into account the sink effect were analyzed.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…Before the next recording of the IVC array, a voltage of −200 V was applied to each probe [11,12,15]. This operation led to the cleaning of the probe surface [29,30].…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Electron sink on the Langmuir probe in plasma, its influence on measurements and methods to account for it

Andreev¹,

Bernatskiy²,

Dyatko³

et al. 2021

Plasma Sources Sci. Technol.

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“…The on-board plasma sensors could benefit from being run by more sensitive, less power-hungry electronics that also have less noise and are capable of a larger measurement range (e.g. [113]). Recent advances in ultra-low power, artificial intelligence-accelerated electronics (e.g.…”

Section: Development Of Better Electronicsmentioning

confidence: 99%

Review of in-space plasma diagnostics for studying the Earth’s ionosphere

Velásquez–García

Izquierdo-Reyes

Kim

2022

J. Phys. D: Appl. Phys.

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This review details the state of the art in in-space plasma diagnostics for characterizing the Earth’s ionosphere. The review provides a historical perspective, focusing on the last 20 years and on eight of the most commonly used plasma sensors—most of them for in situ probing, many of them with completed/in-progress space missions: (a) Langmuir probes, (b) retarding potential analysers, (c) ion drift meters, (d) Faraday cups, (e) integrated miniaturized electrostatic analysers, (f) multipole resonance probes, (g) Fourier transform infrared spectrometers, and (h) ultraviolet absorption spectrometers. For each sensor, the review covers (a) a succinct description of its principle of operation, (b) highlights of the reported hardware flown/planned to fly in a satellite or that could be put in a CubeSat given that is miniaturized, and (c) a brief description of the space missions that have utilized such sensor and their findings. Finally, the review suggests tentative directions for future research.

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