Statistical and formative delay times for sub-nanosecond breakdown at sub-atmospheric pressure

Jordan Chaparro, Lynn Hatfield, Hermann Krompholz, Andreas Neuber

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

For subnanosecond switching, physical phenomena as well as basic breakdown data, such as delay times and breakdown voltages, are of interest. With a RADAN Puiser as source for voltage pulses with up to 180 kV amplitude and risetimes at a test gap of 180 ps, we investigate statistical and formative delays for argon and dry air at sub-atmospheric pressure, for gap widths of 1 and 11 mm. Formative times have minima between 50 and 200 torr, and range from 70 ps at 1.5 MV/cm to 200 ps at 50 kV/cm. For this range of electric fields, this dependence on pressure and applied field can be explained by the behavior of ionization coefficient and electron drift velocity for homogeneous discharges. For higher fields exhibiting a narrow ionization zone in cathode vicinity with pronounced electron runaway conditions, the experimental data agree with results of Monte-Carlo simulations. Statistical delays are about the same as formative delays at fields of 50 kV/cm, and are reduced with increasing field amplitude to less than 50 ps at 1.5 MV/cm. It appears that field emission is the major source for starting electrons, influencing the statistical delay time near the field emission threshold only.

Original languageEnglish
Title of host publicationProceedings of the 2008 IEEE International Power Modulators and High Voltage Conference, PMHVC
Pages503-506
Number of pages4
DOIs
StatePublished - 2008
Event2008 IEEE International Power Modulators and High Voltage Conference, PMHVC - Las Vegas, NV, United States
Duration: May 27 2008May 31 2008

Publication series

NameProceedings of the 2008 IEEE International Power Modulators and High Voltage Conference, PMHVC

Conference

Conference2008 IEEE International Power Modulators and High Voltage Conference, PMHVC
CountryUnited States
CityLas Vegas, NV
Period05/27/0805/31/08

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