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Schematic diagram of the experimental setup. HV—high voltage power supply.
Discharge patterns (upper column) and corresponding wave forms of applied voltage and current (lower column). The discharge current peaks in the third half cycle are enlarged. The patterns (a) random filaments, (b) hexagon, (c) coexistence of hexagon and square, and (d) square are obtained in the air discharge at . The peak voltages are (a) , (b) , (c) , and (d) . The size of images is . Other parameters are and exposure time, .
Phase diagram of the hexagon patterned air discharge at different gas gap widths as a function of air pressure and applied voltage.
Changes of mean distance (mean interparticle space) with increasing voltage when , 1.1, and . Air pressure is .
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