How electrons get accelerated to relativistic energies in a high-Mach-numberquasi-perpendicular shock is presented by means of ab initio particle-in-cellsimulations in three dimensions. We found that coherent electrostatic Bunemanwaves and ion-Weibel magnetic turbulence coexist in a strong-shock structurewhereby particles gain energy during shock-surfing and subsequent stochasticdrift accelerations. Energetic electrons that initially experienced the surfingacceleration undergo pitch-angle diffusion by interacting with magneticturbulence and continuous acceleration during confinement in the shocktransition region. The ion-Weibel turbulence is the key to the efficientnonthermal electron acceleration.
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