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- W2010004443 abstract "Repetitive switching at 10 pulses/s with 1 ps pulses causes a rapid disintegration of the electrodes and a widening of the gap, so increasing the 'breakdown voltage. Immersion in liquid nitrogen increases the life, but again melting and thermal disintegration are observed. If this primitive device is encapsulated in epoxy resin, the lifetime greatly increases and operation at 10 pulses/s for a period of about 1 h is possible. In this case a gradual increase of the breakdown voltage is seen, as would be expected with a melting of the electrodes. It is assumed that encapsulation holds the structure together and inhibits thermal disintegration, thereby prolonging the life. The breakdown is associated with microheating beyond the melting point of gold (1000 C), but this does not necessarily identify the process as thermal breakdown (O'Dwyer 1964). Any electronic breakdown mechanism which produces a conducting region of small enough volume results in rapid heating of this region. In our case, there is enough energy in the stray interelectrode capacitance to produce the observed damage. i he fast switching speed and low temperature switching favor an electronic breakdown. However, the initial breakdown region is so small that any interpretation is complicated by questions of homogeneity. The use of the more resistive, colloidal graphite electrodes inhibits filament formation and reduces the damage caused by rapid discharge of the stray capacitance. In this case the single pulse breakdown regions are not so clearly defined, but obvious melting effects can be seen after several pulses. Even if the breakdown is regarded as electronic in origin, the resultant heating causes melting, especially in ,maintaining the on state. We conclude that for this material, with these electrodes, the significant effect is thermal even for interelectrode spacings of 1 p. This simple technique can be used to study breakdown in a wide range of materials, particularly if the materials are not easy to prepare in thin film form." @default.
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- W2010004443 date "1970-11-15" @default.
- W2010004443 modified "2023-10-18" @default.
- W2010004443 title "Erratum: Low energy gamma-ray transitions in 237Np following α decay of 241Am" @default.
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- W2010004443 doi "https://doi.org/10.1139/p70-346" @default.
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