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Shocks in unmagnetized plasma with a shear flow: Stability and magnetic field generation
Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, Faculty of Science & Engineering. (Scientific Visualization)ORCID iD: 0000-0003-4055-0552
Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, Faculty of Science & Engineering. (Scientific Visualization)ORCID iD: 0000-0002-2849-6146
Centre for Plasma Physics (CPP), Queen's University Belfast, BT7 1NN, Belfast, UK.
Centre for Plasma Physics (CPP), Queen's University Belfast, BT7 1NN, Belfast, UK.
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2015 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 22, no 7, 1-9 p., 072104Article in journal (Refereed) Published
Abstract [en]

A pair of curved shocks in a collisionless plasma is examined with a two-dimensional particle-in-cell simulation. The shocks are created by the collision of two electron-ion clouds at a speed that exceeds everywhere the threshold speed for shock formation. A variation of the collision speed along the initially planar collision boundary, which is comparable to the ion acoustic speed, yields a curvature of the shock that increases with time. The spatially varying Mach number of the shocks results in a variation of the downstream density in the direction along the shock boundary. This variation is eventually equilibrated by the thermal diffusion of ions. The pair of shocks is stable for tens of inverse ion plasma frequencies. The angle between the mean flow velocity vector of the inflowing upstream plasma and the shock's electrostatic field increases steadily during this time. The disalignment of both vectors gives rise to a rotational electron flow, which yields the growth of magnetic field patches that are coherent over tens of electron skin depths.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2015. Vol. 22, no 7, 1-9 p., 072104
Keyword [en]
Electrostatic shock, laser plasma, magnetic field generation, stability
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:liu:diva-120108DOI: 10.1063/1.4926525ISI: 000358933600007OAI: oai:DiVA.org:liu-120108DiVA: diva2:840761
Available from: 2015-07-09 Created: 2015-07-09 Last updated: 2017-12-04

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Publisher's full texthttp://scitation.aip.org/content/aip/journal/pop/22/7/10.1063/1.4926525

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