Current sheet axial dynamics of 2.5 kJ KSU-DPF under high pressure regime

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Show simple item record Mohamed, Amgad E. Abdou, Ali E. Ismail, Mohamed I. Lee, S. Saw, S. H. 2014-03-28T20:48:37Z 2014-03-28T20:48:37Z 2014-03-28
dc.description.abstract In dense plasma focus (DPF) machines, the high-pressure (HP) regime of operation can be used as alternative technique to short-circuit (SC) test as the current sheet motion is minimal. The SC test was performed to get the right values for the static parameters of the machine. HP shots of more than 30 mbar were performed on the 2.5-kJ Kansas State University DPF machine to determine the deviation of HP values from SC values in computed static inductance and resistance. The test was performed using various gases over a wide range of molecular/atomic mass, starting from hydrogen as the lightest gas up to argon. It was found that the deviation in static inductance and resistance computed from HP method is inversely proportional to gas molecular mass at a certain pressure. The heavy gases like neon and argon were found to give the most accurate results. At 60 mbar of argon, the inductance deviation was 6.5%, and the resistance deviation was 14%. It was found also that increasing gas pressure over 30 mbar using heavy gases like Ar or Ne gives no effective improvement on the computed static impedance. Snowplow model was used to predict the axial position and the axial speed of the current sheet during the HP regime. The model showed that the average axial speed in heavy gases like argon was 0.8 cm/ μs, whereas in hydrogen, it was 1.6 cm/μs. en_US
dc.language.iso en_US en_US
dc.relation.uri en_US
dc.subject Plasma focus en_US
dc.subject High pressure discharge en_US
dc.subject Static inductance en_US
dc.subject Plasma resistance en_US
dc.subject Axial speed en_US
dc.subject Snowplow model en_US
dc.title Current sheet axial dynamics of 2.5 kJ KSU-DPF under high pressure regime en_US
dc.type Article (author version) en_US 2012 en_US
dc.citation.doi doi:10.1109/TPS.2012.2210738 en_US
dc.citation.epage 2740 en_US
dc.citation.issue 10 en_US
dc.citation.jtitle IEEE Transactions on Plasma Science en_US
dc.citation.spage 2736 en_US
dc.citation.volume 40 en_US
dc.contributor.authoreid aeabdou en_US

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