Speaker
Description
The Light Dark Matter eXperiment (LDMX) is a planned fixed-target missing-momentum experiment being designed with unique sensitivity for the largely experimentally unexplored MeV-GeV mass range for light dark matter. A key challenge for LDMX is its efficiently at vetoing rare background events such as neutral hadrons stemming from photonuclear reactions in both the target and the setup itself. To achieve this, the experiment relies on a sampling Hadronic Calorimeter (HCal) consisting of alternating layers of polystyrene scintillator bars and steel absorber plates. This configuration is based on the Mu2e experiment's cosmic ray veto.
The current design of the HCal has been optimised based on detailed Geant4 simulations to ensure that the veto performance is sufficient, in particular for the relevant photo-nuclear backgrounds. In order to ensure that the requirements obtained from simulations are accurate, a comparative study of neutron veto inefficiency between Geant4 and FLUKA has been carried out for a simplified version of the LDMX HCal which this contribution will detail.
