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Low Mach-number collisionless shocks and associated ion acceleration

István Pusztai (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)) ; J M Tenbarge ; Aletta N Csapó (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)) ; J Juno ; A Hakim ; Tünde Fülöp (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers))
(2017)
[Preprint]

The existence and properties of low Mach-number electrostatic collisionless shocks are investigated with a semi-analytical solution for the shock structure. We show that the properties of the shock obtained in the semi-analytical model can be well reproduced in fully kinetic Eulerian Vlasov-Poisson simulations, where the shock is generated by the decay of an initial density discontinuity. Using this semi-analytical model, we study the effect of electron-to-ion temperature ratio and presence of impurities on both the maximum shock potential and Mach number. We find that even a small amount of impurities can influence the shock properties significantly, including the reflected light ion fraction, which can change several orders of magnitude. Electrostatic shocks in heavy ion plasmas reflect most of the hydrogen impurity ions.



Denna post skapades 2017-09-08. Senast ändrad 2017-09-12.
CPL Pubid: 251789

 

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Institutioner (Chalmers)

Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)

Ämnesområden

Plasmafysik

Chalmers infrastruktur