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Akerib, D.S.; Alsum, S.; Araújo, H.M.; Bai, X.; Bailey, A.J.; Balajthy, J.; Beltrame, P.; Bernard, E.P.; Bernstein, A.; Biesiadzinski, T.P.; Boulton, E.M.; Brás, P.; Byram, D.; Cahn, S.B.; Carmona-Benitez, M.C.; Chan, C.; Currie, A.; Cutter, J.E.; Davison, T.J.R.; Dobi, A.; Druszkiewicz, E.; Edwards, B.N.; Fallon, S.R.; Fan, A.; Fiorucci, S.; Gaitskell, R.J.; Genovesi, J.; Ghag, C.; Gilchriese, M.G.D.; Hall, C.R.; Hanhardt, M.; Haselschwardt, S.J.; Hertel, S.A.; Hogan, D.P.; Horn, M.; Huang, D.Q.; Ignarra, C.M.; Jacobsen, R.G.; Ji, W.; Kamdin, K.; Kazkaz, K.; Khaitan, D.; Knoche, R.; Larsen, N.A.; Lenardo, B.G.; Lesko, K.T.; Lindote, A.; Lopes, M.I.; Manalaysay, A.; Mannino, R.L.; Marzioni, M.F.; McKinsey, D.N.; Mei, D.-M.; Mock, J.; Moongweluwan, M.; Morad, J.A.; Murphy, A.St.J.; Nehrkorn, C.; Nelson, H.N.; Neves, F.; O'Sullivan, K.; Oliver-Mallory, K.C.; Palladino, K.J.; Pease, E.K.; Rhyne, C.; Shaw, S.; Shutt, T.A.; Silva, C.; Solmaz, M.; Solovov, V.N.; Sorensen, P.; Sumner, T.J.; Szydagis, M.; Taylor, D.J.; Taylor, W.C.; Tennyson, B.P.; Terman, P.A.; Tiedt, D.R.; To, W.H.; Tripathi, M.; Tvrznikova, L.; Uvarov, S.; Velan, V.; Verbus, J.R.; Webb, R.C.; White, J.T.; Whitis, T.J.; Witherell, M.S.; Wolfs, F.L.H.; Xu, J.; Yazdani, K.; Young, S.K.; Zhang, C.
Journal of instrumentation, 02/2018, Letnik: 13, Številka: 2Journal Article
The (x,y) position reconstruction method used in the analysis of the complete exposure of the Large Underground Xenon (LUX) experiment is presented. The algorithm is based on a statistical test that makes use of an iterative method to recover the photomultiplier tube (PMT) light response directly from the calibration data. The light response functions make use of a two dimensional functional form to account for the photons reflected on the inner walls of the detector. To increase the resolution for small pulses, a photon counting technique was employed to describe the response of the PMTs. The reconstruction was assessed with calibration data including 83mKr (releasing a total energy of 41.5 keV) and 3H (β− with Q=18.6keV) decays, and a deuterium-deuterium (D-D) neutron beam (2.45 MeV) . Within the detector's fiducial volume, the reconstruction has achieved an (x,y) position uncertainty of σ=0.82 cm and σ=0.17 cm for events of only 200 and 4,000 detected electroluminescence photons respectively. Such signals are associated with electron recoils of energies ∼0.25 keV and ∼10 keV, respectively. The reconstructed position of the smallest events with a single electron emitted from the liquid surface (22 detected photons) has a horizontal (x,y) uncertainty of 2.13 cm.
