  LINAC 4 is a normal conducting H- structure proposed to intensify the proton
flux currently available for the CERN accelerator chain. This linac is designed
to accelerate a 65 mA beam up to 160 MeV to be injected into the CERN Proton
Synchrotron Booster. The acceleration is performed up to 3 MeV by a
Radio-Frequency Quadrupole resonating at 352 MHz followed by a serie of two
drift tube systems (conventional Alvarez and Cell Coupled Drift Tube Linac)
boosting the beam up to 90 MeV at 352 MHz and finished by a Side Coupled Linac
at 704 MHz. Beam dynamics was studied and optimized performing end-to-end
simulations. Robustness of this design was verified by modelling machine
errors. This paper presents the results of this error study.
