Abstract
Prebreakdown phenomena of KCl (100) in a point-plane electrode system on the application of a high-voltage pulse of 1 ns rise time and 100 ns duration, were investigated by optical methods. Two spike light pulses were detected using a fast photomultiplier just at the instants of application and removal of high voltage for both point polarities. When successive positive pulses were applied to a point electrode the light output decreased monotonically. The light intensity obtained at the second pulse returned to the value of the first one when the time interval between pulses succeeded 3 h. These results can be explained by the effect of space charge associated with the holes, which is formed by positive streamer growth on the application of the preceding pulse.
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