Abstract
Based on the Joule mechanism of vacuum breakdown initiation, the dependence of a pulsed electric strength on the high-voltage pulse duration at a finite rate of electric field buildup in the vacuum gap is calculated. The results of calculations are confirmed by experimental data available for subnanosecond pulses. It is shown that the breakdown delay time has no lower limit at an electric strength of up to ∼3 × 1010 V/m observed in experiment. The independence of the breakdown delay time of the electric field strength for pulse durations comparable with the pulse front width is explained by the finite rate of applied voltage buildup.
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