The simulation of the COHERENT multi-tonne NaI[Tl] detector (NaIvETE)

Coherent Elastic Neutrino-Nucleus Scattering (CEvNS), was first observed by the COHERENT Collaboration in 2017 using a 14.6-kg sodium-doped CsI scintillator detector. Efforts on measuring CEvNS in different types of nuclei in order to test the N² dependence of the cross section, are a current focal point of research. The first 5 modules of the NaI Neutrino Experiment TonnE-scale (NaIvETE) will be deployed this year in the Spallation Neutron Source (SNS) in Oak Ridge National Laboratory (ORNL) to measure CEvNS in ²³Na, as well as the inclusive cross section of the electron neutrino charged-current interactions on ¹²⁷I. Understanding background events prior to deployment of the actual detector is a key part of achieving a successful measurement of CEvNS. To that end, GEANT4 simulations have been implemented. This talk will present our results on the construction of the detector geometry using GEARS, and discuss our latest results of the simulations.