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Abstract A THz-pulse-driven compact, < 150 mm in total length, two-stage electron accelerator setup was designed. It uses 2 × pairs of nearly counter-propagating focused THz pulses. The effects the initial bunch charge and propagation direction pulses on energy accelerated electrons were investigated by numerical simulations. Generation 8 fC bunches with up to 340 keV energy; only 2.0% sprea...