Measurements of the probe characteristics in the pulsed mode in oxygen and helium plasma are presented. The question on the thickness of the near-probe space charge layer in the electron–ion, electron–ion–ion, and ion plasma is discussed. It has been shown that the presence of negative ions in the plasma leads to a drastic decrease in the thickness of the ion layer. A model of the formation of a near-probe layer in nonstationary low-pressure plasma is proposed. It been shown that a space charge layer is formed in the time of 5–6 collisions of ions with neutral particles. It has been illustrated that the displacement current has a linear dependence on the potential applied to the probe. The question concerning the value of the dielectric constant of the plasma is discussed.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 89, No. 2, pp. 464–469, March–April, 2016.
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Gutsev, S.A. Transient Phenomena in Probe Measurements in Low-Density Helium and Oxygen Plasma. J Eng Phys Thermophy 89, 478–483 (2016). https://doi.org/10.1007/s10891-016-1399-3
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DOI: https://doi.org/10.1007/s10891-016-1399-3