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Abstract
The results of an experimental study of the evolution of surface flashover across the surface of an insulator in vacuum subject to a high-voltage pulse and the parameters of the flashover plasma are reported. For the system studied, flashover is always initiated at the cathode triple junctions. Using time-resolved framing photography of the plasma light emission the velocity of the light emission propagation along the surface of the insulator was found to be ∼2.5·108 cm/s. Spectroscopic measurements show that the flashover is characterized by a plasma density of 2–4 × 1014 cm−3 and neutral and electron temperatures of 2–4 eV and 1–3 eV, respectively, corresponding to a plasma conductivity of ∼0.2 Ω−1 cm−1 and a discharge current density of up to ∼10 kA/cm2.
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