Characteristics of direct current microhollow cathode discharges combined with dielectric barrier discharges as preionizer

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Characteristics of direct current microhollow cathode discharges (MHCDs) combined with dielectric barrier discharge (DBD) electrodes as preionization source were studied experimentally and theoretically. The DBD preionization significantly reduced the sparking voltage (from 3.1–3.2to2.4–2.5kV) and improved the spatial uniformity of the multihole MHCDs. Theoretical calculations using the finite element method indicate that the electrons generated by DBDs in the negative phase of the applied voltage could be accelerated into the MHCD electrodes and serve as the seeding electrons for initiating MHCDs. It was experimentally demonstrated that pulselike MHCDs were synchronously triggered by the preionized DBD current pulses.