  We investigate Collisionless Shock Acceleration of spin-polarized ${}^3$He
for laser pulses with normalized vector potentials in the range $a_0 =
100-200$. The setup utilized in the 2D-PIC simulations consists of a solid
Carbon foil that is placed in front of the main Helium target. The foil is
heated by the laser pulse and shields the Helium from the highly oscillating
fields. In turn, a shock wave with more homogeneous fields is induced, leading
to highly polarized ion beams. We observe that the inclusion of radiation
reaction into our simulations leads to a higher beam charge without affecting
the polarization degree to a significant extent.
