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15. Electrical breakdown of submillimeter water gaps.

Author

Schoenbach, K.H., Cooper, J., Garner, A., Goan, B., Joshi, R.P., Kolb, J., Katsuki, S., Kono, S., Laroussi, M., Leipold, F., Lu, X., Mallot, C., Quian, J., and Xiao, S.

Abstract

Electrical breakdown and recovery processes in water have been studied using electrical and nanosecond optical diagnostics. The breakdown electric field in submillimeter gaps with 200 ns voltage pulses applied has been measured as 1 MV/cm, the rate of current rise during breakdown reaches 4⋅1011 A/s. The switch recovery time is determined by expansion and decay of a vapor bubble. The experimental results, together with the results of a model with a percolative approach, provide design criteria for compact, high power, high repetition rate, liquid-switch pulse generators. [ABSTRACT FROM PUBLISHER]

Published
2002

20. High Power Water Switches: Postbreakdown Phenomena and Dielectric Recovery.

Author

Xiao, S., Kolb, J., Kono, S., Katsuki, S., Joshi, R. P., Laroussi, M., and Schoenbach, K. H.

Subjects
DIELECTRICS, EXCITON theory, ELECTRICAL engineering materials, OPTICAL instruments, PHYSICS instruments, OPTICS
Abstract

The physical processes following the electrical breakdown of water between planar and hemispherical electrodes separated by a sub-millimeter gap have been studied using electrical and optical diagnostics. The expanding plasma column after breakdown generates first shockwaves and at a later stage a vapor bubble which expands for about 200 μs and then decays with a time constant of 1 ms. The bubble decay time determines the dielectric recovery of the switch as has been shown with pulse-probe experiments. [ABSTRACT FROM AUTHOR]

Published
2004
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