Particle tracking in the CLIC main beam injector linac

This note presents a particle tracking study in the CLIC Injector Linac, which accelerates both electrons and positrons from 200 MeV to 2.42 GeV, prior to their injection into the damping rings. For the positrons, a growth of the emittance and a large energy spread are observed at the end of the linac, but both effects can be minimized by using a bunch compressor at the exit of the e+ Pre-Injector Linac. For the electrons, no significant increase of the emittance is noticed and the energy spread remains small.