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Modeling of a New Electron Acceleration Mechanism Ahead of Streamers


Metadata FieldValueLanguage
dc.contributorFeng Shi, fzs0002@auburn.eduen_US
dc.creatorIhaddadene, Kevin M. A.
dc.creatorDwyer, Joseph R.
dc.creatorLiu, Ningyu
dc.creatorCelestin, Sebastien
dc.creatorShi, Feng
dc.date.accessioned2020-05-26T17:40:38Z
dc.date.available2020-05-26T17:40:38Z
dc.date.created2019-08
dc.identifier10.1029/2018JA026084en_US
dc.identifier.urihttps://agupubs-onlinelibrary-wiley-com.spot.lib.auburn.edu/doi/abs/10.1029/2018JA026084en_US
dc.identifier.urihttp://hdl.handle.net/11200/49818
dc.description.abstractHead‐on collisions between negative and positive streamers have been proposed as a mechanism behind X‐ray emissions by laboratory spark discharges. Recent simulations using plasma fluid and particle in cell models of a single head‐on collision of two streamers of opposite polarities in ground pressure air predicted an insignificant number of thermal runaway electrons >1 keV and hence weak undetectable X‐ray emissions. Because the current available models of a single streamer collision failed to explain the observations, we first use a Monte Carlo model coupled with multiple static dielectric ellipsoids immersed in a subbreakdown ambient electric field as a description of multiple streamer environment and we investigate the ability of multiple streamer‐streamer head‐on collisions to accelerate runaway electrons >1 keV up to energies ∼200–300 keV instead of just one single head‐on collision. The results of simulations show that the streamer head‐on collision mechanism fails to accelerate electrons; instead, they decelerate in the positive streamer channel. In a second part, we use a streamer plasma fluid model to simulate a new streamer‐electron acceleration mechanism based on a collision of a large negative streamer with a small neutral plasma patch in different Laplacian electric fields |E 0|= (35, 40, 45) kV/cm, respectively. We observe the formation of a secondary short propagating negative streamer with a strong peak electric field >250 up to 378 kV/cm over a time duration of ∼0.16 ns at the moment of the collision. The mechanism produces up to 106 runaway electrons with an upper energy limit of 24 keV.en_US
dc.formatPDFen_US
dc.publisherAMER GEOPHYSICAL UNIONen_US
dc.relation.ispartofJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICSen_US
dc.relation.ispartofseries2169-9380en_US
dc.subjectthermal runaway electrons; negative streamers; laboratory spark discharges; lightning stepped leaders; multiple streamersen_US
dc.subjectX-RAYS; POSITIVE STREAMERS; RUNAWAY ELECTRONS; AIR; DISCHARGE; PHOTOIONIZATION; PROPAGATION; BREAKDOWN; LEADER; FIELDen_US
dc.titleModeling of a New Electron Acceleration Mechanism Ahead of Streamersen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume124en_US
dc.citation.issue8en_US
dc.citation.spage7301en_US
dc.citation.epage7319en_US
dc.description.statusPublisheden_US

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