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Simulation studies of temperature anisotropy driven pair-Alfvén and aperiodic instabilities in magnetized pair plasma
Linköpings universitet, Institutionen för teknik och naturvetenskap, Medie- och Informationsteknik. Linköpings universitet, Tekniska fakulteten. (Scientific Visualization)ORCID-id: 0000-0003-4055-0552
École Normale Supérieure, Lyon, CRAL, UMR CNRS 5574, Université de Lyon, F-69622 Lyon, France.
Universidad de Castilla La Mancha, ETSI Ind, E-13071 Ciudad Real, Spain.
École Normale Supérieure, Lyon, CRAL, UMR CNRS 5574, Université de Lyon, F-69622 Lyon, France.
2019 (engelsk)Inngår i: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 61, nr 8, artikkel-id 085027Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We compare with one-dimensional particle-in-cell simulations the aperiodically growing instabilities driven by a bi-Maxwellian velocity distribution in unmagnetized electron plasma (Weibel instability) and in pair plasma. The simulation box is aligned with the cool direction. The waves in both simulations evolve towards a circularly polarized non-propagating magnetic structure. Its current and magnetic field are aligned and the structure is in a force-free state. We examine how a background magnetic field B 0, which is parallel to the simulation direction, affects the waves in the pair plasma. A weak B 0 cannot inhibit the growth of the aperiodically growing instability but it prevents it from reaching the force-free stable state. The mode collapses and seeds a pair Alfvén waves. An intermediate B 0 couples the thermal anisotropy to the pair Alfvén mode and propagating magnetowaves grow. The phase speed of the pair of Alfvén waves is increased by the thermal anisotropy. Its growth is suppressed when B 0 is set to the value that stabilizes the mirror mode.

sted, utgiver, år, opplag, sider
Institute of Physics Publishing (IOPP), 2019. Vol. 61, nr 8, artikkel-id 085027
Emneord [en]
PIC simulation, pair plasma, anisotropic plasma
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-158633DOI: 10.1088/1361-6587/ab2b2dISI: 000474403600001OAI: oai:DiVA.org:liu-158633DiVA, id: diva2:1335412
Merknad

Funding agencies: Ecole Nationale Superieure de Lyon, Universite de Lyon; French National Program of High Energy (PNHE); Swedish National Infrastructure for Computing (SNIC) at the HPC2N in Umea [SNIC2018-3-408]; French supercomputing facilities GENCI [A0050406960];  [EP/P

Tilgjengelig fra: 2019-07-05 Laget: 2019-07-05 Sist oppdatert: 2019-08-13bibliografisk kontrollert

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