“…At the same time, ICCD imaging showed that the ignition did not occur simultaneously over the channel. A study of pulsed high-voltage nanosecond discharge development in a series of plasmatrons has been conducted in [Nikipelov et al, 2011]. The discharge exhibited three modes of development depending on frequency, voltage and mass flow rate: a surface streamer, a localized spark, and a distributed nonequilibrium transient spark.…”