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Electrostatic shock waves in the laboratory and astrophysics: similarities and differences
Linköpings universitet, Institutionen för teknik och naturvetenskap, Medie- och Informationsteknik. Linköpings universitet, Tekniska fakulteten.ORCID-id: 0000-0003-4055-0552
Queens University of Belfast, North Ireland.
Queens University of Belfast, North Ireland.
Ecole Polytech, France.
Vise andre og tillknytning
2018 (engelsk)Inngår i: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 60, nr 1, artikkel-id 014014Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Contemporary lasers allow us to create shocks in the laboratory that propagate at a speed that matches that of energetic astrophysical shocks like those that ensheath supernova blast shells. The rapid growth time of the shocks and the spatio-temporal resolution, with which they can be sampled, allow us to identify the processes that are involved in their formation and evolution. Some laser-generated unmagnetized shocks are mediated by collective electrostatic forces and effects caused by binary collisions between particles can be neglected. Hydrodynamic models, which are valid for many large-scale astrophysical shocks, assume that collisions enforce a local thermodynamic equilibrium in the medium; laser-generated shocks are thus not always representative for astrophysical shocks. Laboratory studies of shocks can improve the understanding of their astrophysical counterparts if we can identify processes that affect electrostatic shocks and hydrodynamic shocks alike. An example is the nonlinear thin-shell instability (NTSI). We show that the NTSI destabilises collisionless and collisional shocks by the same physical mechanism.

sted, utgiver, år, opplag, sider
IOP PUBLISHING LTD , 2018. Vol. 60, nr 1, artikkel-id 014014
Emneord [en]
particle-in-cell simulation; thin-shell instability; electrostatic shock; unmagnetized plasma
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-142962DOI: 10.1088/1361-6587/aa8c8fISI: 000413836000001OAI: oai:DiVA.org:liu-142962DiVA, id: diva2:1156509
Merknad

Funding Agencies|visiting fellowship of CRAL; EPSRC [EP/P010059/1, EP/K022415/1, EP/N027175/1]; Spanish Ministerio de Educacion [ENE2016-75703-R]; Grand Equipement National de Calcul Intensif (GENCI) [x2014046960]

Tilgjengelig fra: 2017-11-13 Laget: 2017-11-13 Sist oppdatert: 2017-11-14

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