Monte Carlo Simulation of the Neutron Time-of-Flight Facility at CERN

The neutron Time of Flight (n_TOF) facility at CERN is a source of neutrons produced by spallation of 20GeV/c protons onto a solid lead target. The out- standing characteristics of this facility (very high intensity, 200 m flight path, wide spectral function) make it an extremely useful tool that provides the neces- sary data for the design and understanding of Accelerator Driven Systems [1-3]. The proton beam is delivered by the CERN-PS [4] which is capable of providing one to four bunches with an intensity of 71012 protons per bunch, within a 14.4 s supercycle, at a momentum of 20 GeV/c.