Optical calibration system for the LUX-ZEPLIN (LZ) outer detector



Turner, W ORCID: 0000-0002-5958-2856, Baxter, A, Birch, HJ, Boxer, B, Burdin, S ORCID: 0000-0003-4831-4132, Fraser, E, Greenall, A, Powell, S and Sutcliffe, P
(2021) Optical calibration system for the LUX-ZEPLIN (LZ) outer detector. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1010. p. 165551.

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Abstract

The LUX-ZEPLIN experiment will search for dark matter particle interactions with a detector containing a total of 10 tonnes of liquid xenon. Surrounding the liquid xenon cryostat is an outer detector veto system with the primary aim of vetoing neutron single-scatter events in the liquid xenon that could mimic a weakly interacting massive particle (WIMP) dark matter signal. The outer detector consists of approximately 17 tonnes of gadolinium-loaded liquid scintillator confined to 10 acrylic tanks surrounding the cryostat and 228,000 litres of water as the outermost layer. It will be monitored by 120 inward-facing 8-inch photomultiplier tubes. An optical calibration system has been designed and built to calibrate and monitor these photomultiplier tubes allowing the veto system to reach its required efficiency and thus ensuring that LUX-ZEPLIN meets its target sensitivity.

Item Type: Article
Uncontrolled Keywords: Low-background, Optical calibration, Water, Neutron veto, LED
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 09 Mar 2022 10:33
Last Modified: 18 Jan 2023 21:37
DOI: 10.1016/j.nima.2021.165551
Open Access URL: https://arxiv.org/pdf/2102.06281.pdf
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3128007