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    A D2O detector for flux normalization of a pion decay-at-rest neutrino source
    (Journal of Instrumentation, 2021-08-01) Akimov, D; An, P; Awe, C; Barbeau, PS; Becker, B; Belov, V; Bernardi, I; Blackston, MA; Bolozdynya, A; Cabrera-Palmer, B; Chernyak, D; Conley, E; Daughhetee, J; Day, E; Detwiler, J; Ding, K; Durand, MR; Efremenko, Y; Elliott, SR; Fabris, L; Febbraro, M; Gallo Rosso, A; Galindo-Uribarri, A; Green, MP; Heath, MR; Hedges, S; Hoang, D; Hughes, M; Johnson, T; Khromov, A; Konovalov, A; Koros, J; Kozlova, E; Kumpan, A; Li, L; Link, JM; Liu, J; Mann, K; Markoff, DM; Mastroberti, J; Mueller, PE; Newby, J; Parno, DS; Penttila, SI; Pershey, D; Rapp, R; Ray, H; Raybern, J; Razuvaeva, O; Reyna, D; Rich, GC; Ross, J; Rudik, D; Runge, J; Salvat, DJ; Salyapongse, AM; Scholberg, K; Shakirov, A; Simakov, G; Sinev, G; Snow, WM; Sosnovstsev, V; Suh, B; Tayloe, R; Tellez-Giron-Flores, K; Tolstukhin, I; Ujah, E; Vanderwerp, J; Varner, RL; Virtue, CJ; Visser, G; Ward, EM; Wiseman, C; Wongjirad, T; Yen, YR; Yoo, J; Yu, CH; Zettlemoyer, J
    We report on the technical design and expected performance of a 592 kg heavy-water-Cherenkov detector to measure the absolute neutrino flux from the pion-decay-at-rest neutrino source at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL). The detector will be located roughly 20 m from the SNS target and will measure the neutrino flux with better than 5% statistical uncertainty in 2 years. This heavy-water detector will serve as the first module of a two-module detector system to ultimately measure the neutrino flux to 2-3% at both the First Target Station and the planned Second Target Station of the SNS. This detector will significantly reduce a dominant systematic uncertainty for neutrino cross-section measurements at the SNS, increasing the sensitivity of searches for new physics.