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Particle-in-cell simulation of a strong double layer in a nonrelativistic plasma flow: Electron acceleration to ultrarelativistic speeds
Linköpings universitet, Institutionen för teknik och naturvetenskap, Visuell informationsteknologi och applikationer. Linköpings universitet, Tekniska högskolan.ORCID-id: 0000-0003-4055-0552
University Castilla La Mancha.
2009 (engelsk)Inngår i: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 694, nr 1, s. 154-164Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Two charge- and current-neutral plasma beams are modeled with a one-dimensional particle-in-cell simulation. The beams are uniform and unbounded. The relative speed between both beams is 0.4c. One beam is composed of electrons and protons, and the other of protons and negatively charged oxygen (dust). All species have the temperature 9.1 keV. A Buneman instability develops between the electrons of the first beam and the protons of the second beam. The wave traps the electrons, which form plasmons. The plasmons couple energy into the ion acousticwaves, which trap the protons of the second beam. Astructure similar to a proton phase-space hole develops, which grows through its interaction with the oxygen and the heated electrons into a rarefaction pulse. This pulse drives a double layer, which accelerates a beam of electrons to about 50 MeV, which is comparable to the proton kinetic energy. The proton distribution eventually evolves into an electrostatic shock. Beams of charged particles moving at such speeds may occur in the foreshock of supernova remnant (SNR) shocks. This double layer is thus potentially relevant for the electron acceleration (injection) into the diffusive shock acceleration by SNR shocks.

sted, utgiver, år, opplag, sider
2009. Vol. 694, nr 1, s. 154-164
Emneord [en]
acceleration of particles, methods: numerical, plasmas
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-17626DOI: 10.1088/0004-637X/694/1/154OAI: oai:DiVA.org:liu-17626DiVA, id: diva2:210924
Merknad
Original Publication: Mark E Dieckmann and Antoine Bret, Particle-in-cell simulation of a strong double layer in a nonrelativistic plasma flow: Electron acceleration to ultrarelativistic speeds, 2009, Astrophysical Journal, (694), 1, 154-164. http://dx.doi.org/10.1088/0004-637X/694/1/154 Copyright: American Astronomical Society http://www.aas.org/ Tilgjengelig fra: 2009-04-29 Laget: 2009-04-06 Sist oppdatert: 2017-12-13bibliografisk kontrollert

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