Optimal regimes for electrode conditioning in a vacuum by applying voltage pulses with different waveforms are considered. For nanosecond pulses with a constant duration (t(p) = const), the impulse dielectric strength for an oblique voltage wave is shown to be more than four times higher than for a rectangular pulse with an infinitely short leading-edge duration. The dependences of the dielectric strength on the conditioning pulse duration in the range 10(-10) < t(p) < 10(-3) s for pulses with different rise rates are obtained. The dielectric strength increases from 2 x 10(7) V/m for microsecond pulses to 10(10) V/m for subnanosecond pulses.
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