Hardware Testing and Data Analysis of PMTs for D2O Detector

COHERENT is an international collaboration that aims to measure low-energy neutrino cross-sections including coherent elastic neutrino-nucleus scattering (CEvNS) with the neutrinos from the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory. The D2O detector is designed to measure the SNS neutrino flux, which can be used to improve the precision of COHERENT's cross-section measurements. There are two modules constructed identically for the D2O detector. Module 1 is filled with heavy water and Module 2 with light water. We tested the dark rate, energy resolution, signal response, and optimal operating voltage of 14 PMT candidates in dry and underwater conditions to select the 12 best-performing PMTs to be installed in module 2. To understand how the detector responds to energy inputs and cross-check with other analysis efforts, I have been building an independent analysis chain for module 1 data.