  A novel method for the direct measurement of the elusive magnetic and
electric dipole moments of the tau lepton is presented. The experimental
approach relies on the production of tau+ leptons from Ds+ -> tau+ nu_tau
decays, originated in fixed-target collisions at the LHC. A sample of polarized
tau+ leptons is kinematically selected and subsequently channeled in a bent
crystal. The magnetic and electric dipole moments of the tau+ lepton are
measured by determining the rotation of the spin-polarization vector induced by
the intense electromagnetic field between crystal atomic planes. The
experimental technique is discussed along with the expected sensitivities.
