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The formation of the spiral patterns in dielectric-barrier discharge is investigated through instantaneous pictures at successive driving half cycles taken by an intensified-charge coupled device (ICCD). The filaments discretely distributed in each instantaneous picture corresponding to one discharge pulse indicate that they are the basic unit of the spiral patterns. An individual filament can undergo two movement states within continuous discharges: pinning at the same locations and shifting along the arm with a small displacement (less than the filament radius), which results in the formation of smooth arms. The averaged correlation time between the instantaneous patterns is found to be about two driving half-cycles by the cross-correlation calculations.

Formation of spiral patterns in dielectric-barrier discharge investigated by an intensified-charge coupled device