Abstract
A non-equilibrium atmospheric streamer discharge has been investigated as a means to seed a large gap arc breakdown. The dynamics of a surface streamer discharge has been analyzed with high speed imaging, voltage and current characterization as well as light intensity measurements. The temporal evolution of the discharge has been examined and a mechanism for the formation and propagation of the discharge presented. Thermodynamic properties of the atmospheric streamer discharge were determined from a time and spatially averaged spectra and a collisional-radiative model. The electron temperature and density were measured to be 1.25 eV and 10 m respectively. The velocity of the surface streamer was estimated to be ~110 km/s with a diameter of ~400 μm.
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