Transitions between patterned discharges and diffuse discharges in atmospheric helium under applied voltages far below the discharge inception voltage

摘要

A diffuse glow discharge was generated in atmospheric helium with a background air pressure of 40 Pa. When the applied voltage was slowly decreased to lower ones than the discharge inception voltage, the diffuse discharge showed transitions to a patterned one with a central column, then a patterned one with double circles, including one central column and seven or eight nearby columns in a circle, followed by a pattern with three circles, and finally a partial diffuse discharge under an applied voltage of about 66% of the discharge inception voltage. Published by AIP Publishing.