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• W3100983912 endingPage "085015" @default.
• W3100983912 startingPage "085015" @default.
• W3100983912 abstract "We numerically investigate the impact of Coulomb collisions on the ion dynamics in high-$Z$, solid density caesium hydride and copper targets, irradiated by high-intensity ($Iapprox2{-}5times10^{20}{rm,Wcm^{-2}}$), ultrashort (${sim}10{rm,fs}$), circularly polarized laser pulses, using particle-in-cell simulations. Collisions significantly enhance electron heating, thereby strongly increasing the speed of a shock wave launched in the laser-plasma interaction. In the caesium hydride target, collisions between the two ion species heat the protons to ${sim}100{-}1000{rm,eV}$ temperatures. However, in contrast to previous work (A.E. Turrell etal., 2015 Nat. Commun. 6, 8905), this process happens in the upstream only, due to nearly total proton reflection. This difference is ascribed to distinct models used to treat collisions in dense/cold plasmas. In the case of a copper target, ion reflection can start as a self-amplifying process, bootstrapping itself. Afterwards, collisions between the reflected and upstream ions heat these two populations significantly. When increasing the pulse duration to $60{rm,fs}$, the shock front more clearly decouples from the laser piston, and so can be studied without direct interference from the laser. The shock wave formed at early times exhibits properties typical of both hydrodynamic and electrostatic shocks, including ion reflection. At late times, the shock is seen to evolve into a hydrodynamic blast wave." @default.
• W3100983912 created "2020-11-23" @default.
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• W3100983912 date "2020-07-14" @default.
• W3100983912 modified "2023-10-05" @default.
• W3100983912 title "Collisional effects on the electrostatic shock dynamics in thin-foil targets driven by an ultraintense short pulse laser" @default.
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• W3100983912 doi "https://doi.org/10.1088/1361-6587/ab9a62" @default.
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