Abstract
Trigatron spark-gap discharges with very long time lags to breakdown were observed and their characteristics investigated in order to determine the discharge mechanism. The main voltage was applied with a predetermined delay after the trigger pulse, and breakdown with a time lag of many hundreds of microseconds at voltages from 30 to 80% of the untriggered breakdown voltage has been observed. Photographs show a distinctive discharge path along a spherical shell around the trigger spark region. These results support the idea that the triggering of these long-time-lag discharges is due to a mechanism evolving in a different way from those previously accounted for triggered sparks.
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