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The acceleration of polarized electron beams in the blowout regime ofplasma-based acceleration is explored. An analytical model for the spinprecession of single beam electrons, and depolarization rates of zero emittanceelectron beams, is derived. The role of finite emittance is examinednumerically by solving the equations for the spin precession with a spintracking algorithm. The analytical model is in very good agreement with theresults from 3D particle-in-cell simulations in the limits of validity of ourtheory. Our work shows that the beam depolarization is lower for high-energyaccelerator stages, and that under the appropriate conditions, thedepolarization associated with the acceleration of 100-500 GeV electrons can bekept below 0.1-0.2%.

Polarized Beam Conditioning in Plasma Based Acceleration