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Processes in afterglow responsible for initiation of electrical breakdown in xenon at low pressure

Published online by Cambridge University Press:  22 February 2013

MOMČILO M. PEJOVIĆ ,
IVANA V. SPASIĆ ,
MILIĆ M. PEJOVIĆ ,
NIKOLA T. NEŠIĆ  and
DRAGAN V. BRAJOVIĆ
MOMČILO M. PEJOVIĆ
Affiliation:
Faculty of Electronic Engineering, University of Niš, Aleksandra Medvedeva 14, 18000 Niš, Serbia (momcilo.pejovic@elfak.ni.ac.rs) Center of Scientific Research of the Serbian Academy of Science and Arts, University of Niš, Univerzitetski trg 2, 18000 Niš, Serbia
IVANA V. SPASIĆ
Affiliation:
Faculty of Electronic Engineering, University of Niš, Aleksandra Medvedeva 14, 18000 Niš, Serbia (momcilo.pejovic@elfak.ni.ac.rs)
MILIĆ M. PEJOVIĆ
Affiliation:
Faculty of Electronic Engineering, University of Niš, Aleksandra Medvedeva 14, 18000 Niš, Serbia (momcilo.pejovic@elfak.ni.ac.rs)
NIKOLA T. NEŠIĆ
Affiliation:
Faculty of Electronic Engineering, University of Niš, Aleksandra Medvedeva 14, 18000 Niš, Serbia (momcilo.pejovic@elfak.ni.ac.rs)
DRAGAN V. BRAJOVIĆ
Affiliation:
Faculty of Electrical Engineering, University of Belgrade, Bulevar Kralja Aleksandra 73, 11000 Belgrade, Serbia
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Abstract

The processes responsible for initiation of electrical breakdown in xenon-filled tube with two spherical iron electrodes at 2.7-mbar pressure have been analyzed. The analysis is based on the experimental data of electrical breakdown time delay as a function of afterglow period. It is shown that positive ions remaining from previous discharge, as well as positive ions created in mutual collisions of metastable atoms in afterglow, have a dominant role in secondary emission of electrons from the cathode which lead to initiation of breakdown in early afterglow. In late afterglow, dominant role in initiation of breakdown is taken by N(4S) atoms formed during the discharge by dissociation of ground state nitrogen molecules that are present as impurities in xenon. When the concentration of N(4S) atoms decreases sufficiently, the initiation of breakdown is caused by cosmic radiation. Small doses of gamma-ray irradiation also contribute to the initiation of breakdown, but only for large values of the afterglow period.

Type
Papers
Information
Journal of Plasma Physics , Volume 79 , Issue 5 , October 2013 , pp. 641 - 646
Copyright
Copyright © Cambridge University Press 2013 

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