  We propose a new approach based on an all-optical set-up for generating
relativistic polarized electron beams via vortex Laguerre-Gaussian (LG)
laser-driven wakefield acceleration. Using a pre-polarized gas target, we find
that the topology of the vortex wakefield resolves the depolarization issue of
the injected electrons. In full three-dimensional particle-in-cell simulations,
incorporating the spin dynamics via the Thomas-Bargmann Michel Telegdi
equation, the LG laser preserves the electron spin polarization by more than
80% at high beam charge and flux. The method releases the limit on beam flux
for polarized electron acceleration and promises more than an order of
magnitude boost in peak flux, as compared to Gaussian beams. These results
suggest a promising table-top method to produce energetic polarized electron
beams.
