Time-Resolved Measurements of Electron Density in Nanosecond Pulsed Plasmas Using Microwave Scattering
Abstract
In this work, Rayleigh microwave scattering was utilized to measure the electron number density produced by nanosecond high voltage breakdown in air between two electrodes in a pin-to-pin configuration (peak voltage 26 kV and pulse duration 55 ns). The peak electron density decreased from 1*1017 cm-3 down to 7*1014 cm-3 when increasing the gap distance from 2 to 8 mm (total electron number decreased from 2*1013 down to 5*1011 respectively). Electron number density decayed on the timescale of about several microseconds due to dissociative recombination.
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