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Magnetic field suppression in collision-less shocks generatedduring the expansion of a dense plasma into a rarefied medium

Published online by Cambridge University Press:  13 February 2013

G. Sarri ,
M.E. Dieckmann ,
I. Kourakis  and
M. Borghesi
G. Sarri
Affiliation:
School of Mathematics and Physics, The Queen’s University of Belfast, Belfast BT7 1NN, UK
M.E. Dieckmann
Affiliation:
School of Mathematics and Physics, The Queen’s University of Belfast, Belfast BT7 1NN, UK
I. Kourakis
Affiliation:
School of Mathematics and Physics, The Queen’s University of Belfast, Belfast BT7 1NN, UK
M. Borghesi
Affiliation:
School of Mathematics and Physics, The Queen’s University of Belfast, Belfast BT7 1NN, UK

Abstract

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A two-dimensional numerical study of the expansion of a dense plasma through a morerarefied one is reported. The electrostatic ion-acoustic shock, which is generated duringthe expansion, accelerates the electrons of the rarefied plasma inducing a superthermalpopulation which reduces electron thermal anisotropy. The Weibel instability is thereforenot triggered and no self-generated magnetic fields are observed, in contrast withpublished theoretical results dealing with plasma expansion into vacuum.

References

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