Abstract
Measurements of breakdown time lags have been made in gaps of up to 1 mm in ultra-high vacuum. A clear discontinuity has been found in the distribution of these times demonstrating that breakdown takes place either within 30 ns of applying the voltage or after a long time delay of up to several ms. Comparison of measured and calculated data suggests that, as the applied voltage is increased, there may be a change in breakdown mechanism from one involving heating and evaporation of the emitting site at the cathode to one involving evaporation of the target site at the anode.
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