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• W2963148780 abstract "In this second paper of a series, we discuss the dynamics of a plasma entering the precursor of an unmagnetized, relativistic collisionless pair shock. We discuss how this background plasma is decelerated and heated through its interaction with a microturbulence that results from the growth of a current filamentation instability (CFI) in the shock precursor. We make use, in particular, of the reference frame $mathcal R_{rm w}$ in which the turbulence is mostly magnetic. This frame moves at relativistic velocities towards the shock front at rest, decelerating gradually from the far to the near precursor. In a first part, we construct a fluid model to derive the deceleration law of the background plasma expected from the scattering of suprathermal particles off the microturbulence. This law leads to the relationship $gamma_{rm p},sim,xi_{rm b}^{-1/2}$ between the background plasma Lorentz factor $gamma_{rm p}$ and the normalized pressure of the beam $xi_{rm b}$; it is found to match nicely the spatial profiles observed in large-scale 2D3V particle-in-cell simulations. In a second part, we model the dynamics of the background plasma at the kinetic level, incorporating the inertial effects associated with the deceleration of $mathcal R_{rm w}$ into a Vlasov-Fokker-Planck equation for pitch-angle diffusion. We show how the effective gravity in $mathcal R_{rm w}$ drives the background plasma particles through friction on the microturbulence, leading to efficient plasma heating. Finally, we compare a Monte Carlo simulation of our model with dedicated PIC simulations and conclude that it can satisfactorily reproduce both the heating and the deceleration of the background plasma in the shock precursor, thereby providing a successful 1D description of the shock transition at the microscopic level." @default.
• W2963148780 created "2019-07-30" @default.
• W2963148780 creator A5061997570 @default.
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• W2963148780 date "2019-09-24" @default.
• W2963148780 modified "2023-10-16" @default.
• W2963148780 title "Physics of relativistic collisionless shocks. II. Dynamics of the background plasma" @default.
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• W2963148780 doi "https://doi.org/10.1103/physreve.100.033209" @default.
• W2963148780 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31639946" @default.
• W2963148780 hasPublicationYear "2019" @default.
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