Current distribution during the breakdown in a coaxial electrode system

Autor:	J. Feugeas, O. von Pamel
Rok vydání:	1989
Předmět:	Dense plasma focus Chemistry Analytical chemistry General Physics and Astronomy Insulator (electricity) law.invention Capacitor law Rise time Electrode Electric current Atomic physics Coaxial Current density
Zdroj:	Journal of Applied Physics. 66:1080-1083
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.343444
Popis:	The breakdown stage in a coaxial electrode system (similar to Mather‐type plasma focus) was studied in hydrogen for a wide range of pressures through the fast discharge of the energy stored in a parallel plate capacitor. A peak current Iep of 18.5 kA was reached in 60 ns for a 20 kV capacitor charge voltage, giving the typical initial current rise time obtained in normal plasma focus discharges. Thin current sheaths (≲2 mm thick) in the insulator region with current density ≳10 kA/cm2 were measured. These current sheaths always showed a well‐defined filamentary structure with the number of filaments depending linearly on Iep , with an observed current limit per filament If depending on the pressure P as I2f∼1/P.
Databáze:	OpenAIRE
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