Abstract
Transition of field-emitted electrons into the runaway mode is investigated in the region of enhanced electric field determined by the configuration of a microtip on a cathode for various gas media composition and pressure. The research is done using simulation of electron motion in the inhomogeneous electric field with a help of the Monte-Carlo procedure in the 3D configuration. Calculations were carried out for Nitrogen, Hydrogen and CO2:N2:He mixture (1:1:3). It’s shown that passage through a relatively small region of the enhanced field in the vicinity of the micro-spike may substantially facilitate electron transition to the runaway mode. This effect enhances at pressures of greater than 10 atm. In our opinion, the resulting runaway electrons may provide pre-ionization of gas medium and formation of the initial stage of a volume discharge. The results obtained are of interest for studies of the switching properties of ultrahigh pressure gaps and the use of a volume discharge for lasers pumping.
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