Simulating Long Neutron Beamlines Using Duct Source Variance Reduction in Geant4
The European Spallation Source, ESS, is set to become the world's brightest spallation neutron source. Spallation neutron sources present unique challenges with regards to radiation shielding due to the creation of a significant number of high energy neutrons during nuclear reactions in the spallation target. These can reach up to the energy of the driving proton beam. Performing Monte Carlo s
