NUMERICAL STUDY OF FORMATION OF NEGATIVE STREAMER OF PULSE HIGH-VOLTAGE DISCHARGE IN AIR BUBBLE IN WATER

A mathematical model of the formation of a negative streamer in a pulsed high-voltage discharge in an air bubble in water is proposed. Numerical calculations demonstrate the spatiotemporal development of the streamer within the air bubble, the propagation of the streamer wave toward the «gas (plasma) – water» boundary, the spreading of the discharge along the water surface, and the formation of the most ionized submillimeter region with an electron concentration of ~7.2∙1016 cm–3 directly at the tip. In contrast, the average electron concentration in the streamer channel is ~3∙1015 cm–3.