Abstract
Measurements have been made of initial phases of breakdown in a short negative point-to-plane gap in nitrogen and in a N2+10%CH4 mixture at pressures of 25∼100 Torr in order to verify Morrow's theory of stepped pulses in negative corona discharges. This theory explains the step observed on the current growth (Trichel pulse) wavefront in terms of independent photon and ion secondary processes at the cathode. The comparison of current growth waveforms in N2 and in a N2+10%CH4 mixture, where photoemission is suppressed, shows good qualitative agreement with Morrow's theory.
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