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Schematic illustration of the discharge system used in this study. A side view (A) of the discharge chamber and its cross section (B). (C) A photograph of a typical discharge with a He/O2 gas admixture with a pressure ratio of 5:1, total pressure of 0.6 kPa, an operating voltage (zero-to-peak) of 2.1 kV, and a frequency of 40 kHz. An IP-CHA disc of 5 mm diameter (φ) and 2 mm height (h) is seen in the discharge chamber.
