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This content will become publicly available on February 1, 2019

Title: Position reconstruction in LUX

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 = 18.6 keV) 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. Lastly, the reconstructed position of the smallest events with a single electron emitted from the liquid surface (22 detected photons)more » has a horizontal (x, y) uncertainty of 2.13 cm.« less
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Publication Date:
Grant/Contract Number:
AC02-76SF00515; AC02-05CH11231; AC05-06OR23100; AC52-07NA27344; FG01-91ER40618; FG02-08ER41549; FG02-11ER41738; FG02-91ER40674; FG02-91ER40688; FG02- 95ER40917; NA0000979; SC0006605; SC0010010; SC0015535; PHY-0750671; PHY-0801536; PHY- 1003660; PHY-1004661; PHY-1102470; PHY-1312561; PHY-1347449; PHY-1505868; PHY-1636738; RA0350; PTDC/FIS-NUC/1525/2014; IE120804; ST/K502042/1; ST/K502406/1; ST/M503538/1
Type:
Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 13; Journal Issue: 02; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); Sanford Underground Research Facility (SURF)
Contributing Orgs:
LUX collaboration
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 79 ASTRONOMY AND ASTROPHYSICS; dark matter; position reconstruction; xenon
OSTI Identifier:
1424029