EXPERIMENTAL MEASUREMENT OF ION-CONCENTRATION IN ARC PLASMA SEEDED WITH SIO2 AT ATMOSPHERIC PRESSURE

In this piece of study arc plasma was produced inside the vacuum chamber using dc power supply in order to measure the plasma parameter especially ion-concentration in arc plasma. Widely used moving Langmuir probes were successfully applied to measure the probe current at different values of the potential applied on the probe. The graph was plotted between the probe current and the probe potential, using the data obtained from the experimental set up of Double Probe Method (DPM) for the SiO₂ arc plasma at atmospheric pressure. The ion- concentration was estimated to be in the range of 1.65´10¹⁸ to 4.71´10¹⁸ions m^-3, using the upper branch of the graph and range of 1.47´10¹⁸ to 4.27´10¹⁸ ions m^-3, using the lower branch of the graph.