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A simple Semi-Analytical method used to fit the experimentally recorded current of the closed switch discharge circuit into the free running under damped LC oscillator model and the arc plasma conductivity, electron density of the plasma and efficiency of the spark gap switch energy transfer have been driven from the model by some simple calculations. The charging voltage, switch pressure and the spark-gap has been changed between 6 to 15 kV, 1 to 1.5 bar and 1.4 or 2.8 mm, respectively. The obtained values for plasma conductivity and electron density of plasma are (5-25)(Ω mm) −1 , (0.5-3.5)·10 24 m −3 , respectively. The efficiency of the switch is plotted Vs. Pd and E/P which in both cases the peak value has been about 80 present.

In this study, the electron density of plasma discharge has been obtained using the innovative combination of a basic theoretical relation and measured current-voltage characteristics of a uniform glow discharge of a spark array TEA-CO 2 laser. The maximum values of electron densities have been obtained as 1.93 × 10 13 , 1.95 × 10 13 and 2.15 × 10 13 cm −3 , respectively, for charging voltage of discharges at 18, 20 and 22 kV. The drift velocity of electrons has been obtained in the different conditions versus the reduced electric field (E/N) and gas mixtures in the discharge tube. Furthermore, the efficiency in energy conversion and the behavior of electrical energy density versus reduced electric field has been studied.