Calculation of time dependence of the electrode surface temperature in the cathode spot of atmospheric pressure normal glow discharge

Abstract

Non stationary heat transfer in the volume of the electrode with the cathode spot of atmospheric pressure normal glow discharge on its surface is calculated in case the spot radius is much less than the electrode dimensions. A system of equations describing variation of the temperature in the spot and the discharge cathode sheath parameters after discharge ignition is formulated, and the time dependence of the electrode temperature in the spot for discharge in helium is found. It is shown that within a short time fast heating of the electrode sur face in the spot proceeds and then its temperature is slowly approaching the equilibrium value.

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“…The increasing electrode temperature is due to the energy transfer from the reactive species in the plasma (ions, electrons, and metastable species) to the electrode surface . The time dependence of the electrode temperature and the maximum temperature are similar to those reported by Kristya on an atmospheric pressure glow discharge in helium Figure also shows that once the glow discharge is turned off, the electrode temperature drops to room temperature after approximately 30 s from radiative and convective cooling in CAM.…”

“…47 The time dependence of the electrode temperature and the maximum temperature are similar to those reported by Kristya on an atmospheric pressure glow discharge in helium. 48 Figure 6 also shows that once the glow discharge is turned off, the electrode temperature drops to room temperature after approximately 30 s from radiative and convective cooling in CAM. This rapid heating and cooling of the electrode assures short collection cycles.…”