TITLE

Modeling of discharges generated by electron beams in dense gases: Fountain and thunderstorm regimes

AUTHOR(S)
Macheret, S. O.; Shneider, M. N.; Miles, R. B.
PUB. DATE
May 2001
SOURCE
Physics of Plasmas;May2001, Vol. 8 Issue 5, p1518
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In this paper we present an analysis of the predicted dynamics of plasmas generated in air and other gases by injecting beams of high-energy electrons. Two distinct regimes are found, differing in the way that the excess negative charge brought in by the ionizing electron beam is removed. In the first regime, called a fountain, the charge is removed by the back current of plasma electrons toward the injection foil. In the second, called a thunderstorm, a substantial cloud of negative charge accumulates, and the increased electric field near the cloud causes a streamer to strike between the cloud and a positive or grounded electrode, or between two clouds created by two different beams. A quantitative analysis, including electron beam propagation, electrodynamics, charge particle kinetics, and a simplified heat balance, is performed in a one-dimensional approximation.
ACCESSION #
4716570

 

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