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Simulation of a collisionless planar electrostatic shock in a proton–electron plasma with a strong initial thermal pressure change
Linköpings universitet, Institutionen för teknik och naturvetenskap, Visuell informationsteknologi och applikationer. Linköpings universitet, Tekniska högskolan.ORCID-id: 0000-0003-4055-0552
Centre for Plasma Physics, Queen's University Belfast, Belfast BT7 1NN, UK.
Centre for Plasma Physics, Queen's University Belfast, Belfast BT7 1NN, UK.
Centre for Plasma Physics, Queen's University Belfast, Belfast BT7 1NN, UK.
Vise andre og tillknytning
2010 (engelsk)Inngår i: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 52, nr 2, s. 025001-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The localized deposition of the energy of a laser pulse, as it ablates a solid target, introduces high thermal pressure gradients in the plasma. The thermal expansion of this laser-heated plasma into the ambient medium (ionized residual gas) triggers the formation of non-linear structures in the collisionless plasma. Here an electron–proton plasma is modelled with a particle-in-cell simulation to reproduce aspects of this plasma expansion. A jump is introduced in the thermal pressure of the plasma, across which the otherwise spatially uniform temperature and density change by a factor of 100. The electrons from the hot plasma expand into the cold one and the charge imbalance drags a beam of cold electrons into the hot plasma. This double layer reduces the electron temperature gradient. The presence of the low-pressure plasma modifies the proton dynamics compared with the plasma expansion into a vacuum. The jump in the thermal pressure develops into a primary shock. The fast protons, which move from the hot into the cold plasma in the form of a beam, give rise to the formation of phase space holes in the electron and proton distributions. The proton phase space holes develop into a secondary shock that thermalizes the beam.

sted, utgiver, år, opplag, sider
Bristol: Institute of Physics and IOP Publishing Limited , 2010. Vol. 52, nr 2, s. 025001-
Emneord [en]
laser plasma, shock, electrostatic
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-53188DOI: 10.1088/0741-3335/52/2/025001OAI: oai:DiVA.org:liu-53188DiVA, id: diva2:287572
Tilgjengelig fra: 2010-01-19 Laget: 2010-01-19 Sist oppdatert: 2017-12-12

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Forlagets fullteksthttp://www.iop.org/EJ/abstract/0741-3335/52/2/025001

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