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We use 3D simulations to demonstrate that high-quality ultra-relativisticelectron bunches can be generated upon reflection of a twisted laser beam off aplasma mirror. The unique topology of the beam with a twist index $|l| = 1$creates an accelerating structure dominated by longitudinal laser electric andmagnetic fields in the near-axis region. We show that the magnetic field isessential for creating a train of dense mono-energetic bunches. For a 6.8~PWlaser, the energy reaches 1.6~GeV with a spread of 5.5\%. The bunch duration is320 as, its charge is 60~pC and density is $\sim 10^{27}$~m$^{-3}$. The resultsare confirmed by an analytical model for the electron energy gain. Theseresults enable development of novel laser-driven accelerators at multi-PW laserfacilities.

physical review letters

Generation of ultra-relativistic monoenergetic electron bunches via a  synergistic interaction of longitudinal electric and magnetic fields of a  twisted laser