Dual color x rays from Thomson or Compton sources

We analyze the possibility of producing two color X or gamma radiation by Thomson/Compton backscattering between a high intensity laser pulse and a two-energy level electron beam, constituted by a couple of beamlets separated in time and/or energy obtained by a photoinjector with comb laser techniques and linac velocity bunching The parameters of the Thomson source at SPARC LAB have been simulated, proposing a set of values for a realistic experiments.