  We propose a twisted plasma accelerator capable of generating relativistic
electron vortex beams with helical current profiles. The angular momentum of
these vortex bunches is quantized, dominates their transverse motion, and
results in spiraling particle trajectories around the twisted wakefield. We
focus on a laser wakefield acceleration scenario, driven by a laser beam with a
helical spatiotemporal intensity profile, also known as a light spring. We find
that these light springs can rotate as they excite the twisted plasma
wakefield, providing a new mechanism to control the twisted wakefield phase
velocity and enhance energy gain and trapping efficiency beyond planar
wakefields.
