Radiation Simulation for the Study of Muon Shield Scenarios in LHCb U2

LHCb will be increasing its luminosity in Run 5 to a factor of to 10$^{34}$ cm$^{-2}$s$^{-1}$ and so additional radiation shielding will need to be developed within the detector. This project studied different muon system shielding options for U2, including an additional polyethylene and boron neutron shield behind the HCAL and replacing the HCAL with an iron and concrete block. Simulations were run using FLUKA, a monte-carlo software designed for simulating the interaction and transport of particles, and ratio plots were made in order to compare how the radiative environment changed between each geometry. In addition, the effect of the tungsten and lead bricks recently added within the detector was simulated and analysed. It was concluded that replacing the HCAL with an iron and concrete block increased neutron backscattering within the detector. Furthermore, adding a polyethylene and boron neutron shield mitigated the neutron fluence within the muon system, protecting it from neutron damage.