Abstract

The transition from the low-pressure diffuse to the high-pressure filamentary domain of a 9.5GHz microwave-induced surface discharge in air is recorded. The discharge employs several half-wavelength initiators that locally enhance the electric field to achieve breakdown in the higher-pressure subcritical region. Visible light imaging illustrates the qualitative changes in discharge morphology over the pressure range 4.5to760Torr (0.6to100kPa).

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