Generation of a purely electrostatic collisionless shock during the expansion of a dense plasma through a rarefied medium
2011 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 107, no 2, 025003-1-025003-4 p.Article in journal (Refereed) Published
A two-dimensional numerical study of the expansion of a dense plasma through a more rarefied one is reported. The electrostatic ion-acoustic shock, which is generated during the expansion, accelerates the electrons of the rarefied plasma inducing a superthermal population which reduces electron thermal anisotropy. The Weibel instability is therefore not triggered and no self-generated magnetic fields are observed, in contrast with published theoretical results dealing with plasma expansion into vacuum. The shock front develops a filamentary structure which is interpreted as the consequence of the electrostatic ion-ion instability, consistently with published analytical models and results.
Place, publisher, year, edition, pages
2011. Vol. 107, no 2, 025003-1-025003-4 p.
simulation, shock, electrostatic wave
National CategoryFusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:liu:diva-69642DOI: 10.1103/PhysRevLett.107.025003OAI: oai:DiVA.org:liu-69642DiVA: diva2:430420
ProjectsVetenskapsradet Dnr: 2010-4063
FunderSwedish Research Council