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Cocoon formation by a mildly relativistic pair jet in unmagnetized collisionless electron-proton plasma
Linköpings universitet, Institutionen för teknik och naturvetenskap, Medie- och Informationsteknik. Linköpings universitet, Tekniska fakulteten. (Scientific Visualization)ORCID-id: 0000-0003-4055-0552
Centre for Plasma Physics (CPP), Queen's University Belfast, Belfast, United Kingdom.ORCID-id: 0000-0003-1800-343X
École Normale Supérieure, Université de Lyon, Lyon, France.ORCID-id: 0000-0002-1398-4374
École Normale Supérieure, Université de Lyon, Lyon, France.
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2018 (engelsk)Inngår i: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 25, nr 11, artikkel-id 112903Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

By modelling the expansion of a cloud of electrons and positrons with the temperature of 400 keV which propagates at the mean speed of 0.9c (c: speed of light) through an initially unmagnetized electron-proton plasma with a particle-in-cell simulation, we find a mechanism that collimates the pair cloud into a jet. A filamentation (beam-Weibel) instability develops. Its magnetic field collimates the positrons and drives an electrostatic shock into the electron-proton plasma. The magnetic field acts as a discontinuity that separates the protons of the shocked ambient plasma, known as the outer cocoon, from the jet's interior region. The outer cocoon expands at the speed of 0.15c along the jet axis and at 0.03c perpendicularly to it. The filamentation instability converts the jet's directed flow energy into magnetic energy in the inner cocoon. The magnetic discontinuity cannot separate the ambient electrons from the jet electrons. Both species rapidly mix and become indistinguishable. The spatial distribution of the positive charge carriers is in agreement with the distributions of the ambient material and the jet material predicted by a hydrodynamic model apart from a dilute positronic outflow that is accelerated by the electromagnetic field at the jet's head.

sted, utgiver, år, opplag, sider
American Institute of Physics (AIP), 2018. Vol. 25, nr 11, artikkel-id 112903
Emneord [en]
PIC simulations, pair plasma, relativistic jets
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-153199DOI: 10.1063/1.5050599ISI: 000451734600031OAI: oai:DiVA.org:liu-153199DiVA, id: diva2:1267280
Merknad

Funding agencies:  Ecole Nationale Superieure de Lyon, Universite de Lyon; French National Program of High Energy (PNHE); EPSRC [EP/N027175/1]; French supercomputing facilities GENCI [EP/P02212X/1, A0030406960]

Tilgjengelig fra: 2018-11-30 Laget: 2018-11-30 Sist oppdatert: 2018-12-20bibliografisk kontrollert

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