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Expansion of a mildly relativistic hot pair cloud into an 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, BT7 1NN, UK.
Centre for Plasma Physics (CPP), Queen's University Belfast, BT7 1NN, UK.
2018 (engelsk)Inngår i: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 25, nr 6, artikkel-id 062122Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The expansion of a charge-neutral cloud of electrons and positrons with the temperature 1 MeV into an unmagnetized ambient plasma is examined with a 2D particle-in-cell simulation. The pair outflow drives solitary waves in the ambient protons. Their bipolar electric fields attract electrons of the outflowing pair cloud and repel positrons. These fields can reflect some of the protons, thereby accelerating them to almost an MeV. Ion acoustic solitary waves are thus an efficient means to couple energy from the pair cloud to protons. The scattering of the electrons and positrons by the electric field slows down their expansion to a nonrelativistic speed. Only a dilute pair outflow reaches the expansion speed expected from the cloud's thermal speed. Its positrons are more energetic than its electrons. In time, an instability grows at the front of the dense slow-moving part of the pair cloud, which magnetizes the plasma. The instability is driven by the interaction of the outflowing positrons with the protons. These results shed light on how magnetic fields are created and ions are accelerated in pair-loaded astrophysical jets and winds.

sted, utgiver, år, opplag, sider
American Institute of Physics (AIP), 2018. Vol. 25, nr 6, artikkel-id 062122
Emneord [en]
PIC simulation, pair plasma, filamentation instability
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-148878DOI: 10.1063/1.5036954ISI: 000437193700036OAI: oai:DiVA.org:liu-148878DiVA, id: diva2:1222167
Tilgjengelig fra: 2018-06-21 Laget: 2018-06-21 Sist oppdatert: 2018-08-13

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