Abstract
This paper describes some aspects of the development of the Townsend discharge into a spark channel. Three different stages of the discharge growth are distinguished. The first of these is obtained when the discharge current is of the order of mA-A and this is followed by the second stage, i.e. a transition to a filamentary glow phase which may appear, depending on the energy supplied, either before or after a cathode spot is formed. The final stage, termed here the second glow phase, leads to the formation of the filamentary spark channel.
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