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We present a detailed investigation of the NLO polarization of the top quarkin t t-bar production at a polarized linear e^+ e^- collider withlongitudinally polarized beams. By appropiately tuning the polarization of thebeams one can achieve close to maximal values for the top quark polarizationover most of the forward hemisphere for a large range of energies. This isquite welcome since the rate is largest in the forward hemisphere. One can alsotune the beam polarization to obtain close to zero polarization over most ofthe forward hemisphere.

Single top quark polarization at O(alpha_s) in t t-bar production at a polarized linear e^+ e^- collider