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We numerically investigate the impact of Coulomb collisions on the iondynamics in high-$Z$, solid density caesium hydride and copper targets,irradiated by high-intensity ($I\approx2{-}5\times10^{20}{\rm\,Wcm^{-2}}$),ultrashort (${\sim}10{\rm\,fs}$), circularly polarized laser pulses, usingparticle-in-cell simulations. Collisions significantly enhance electronheating, thereby strongly increasing the speed of a shock wave launched in thelaser-plasma interaction. In the caesium hydride target, collisions between thetwo 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 protonreflection. This difference is ascribed to distinct models used to treatcollisions in dense/cold plasmas. In the case of a copper target, ionreflection can start as a self-amplifying process, bootstrapping itself.Afterwards, collisions between the reflected and upstream ions heat these twopopulations significantly. When increasing the pulse duration to $60{\rm\,fs}$,the shock front more clearly decouples from the laser piston, and so can bestudied without direct interference from the laser. The shock wave formed atearly times exhibits properties typical of both hydrodynamic and electrostaticshocks, including ion reflection. At late times, the shock is seen to evolveinto a hydrodynamic blast wave.

Collisional effects on the electrostatic shock dynamics in thin-foil targets driven by an ultraintense short pulse laser