Abstract
According to the “avalanche theory” of dielectric breakdown, the breakdown occurs by the energy dissipation of electron avalanche composed of sufficient number of secondary electrons. Therefore, the breakdown probability is equal to the average frequency with which the avalanches of such a sufficient sizes occur. On the other hand, the breakdown probability can be obtained by the measurement of the statistical time lag of the breakdown. In this paper, we measured the statistical time lag of breakdown of mica and the pulse size distribution of avalanche noise in the pre-breakdown region. Correlating the both results from the view point of avalanche mechanism, we obtained 10 8 as the avalanche size which is just sufficient to produce disruption for our specimens which were 3∼5×10 -4 cm in thickness.
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