The calibration system for the photomultiplier array of the SNO+ experiment

R. Alves (1) , S. Andringa (2) , S. Bradbury (3) , J. Carvalho (1) , D. Chauhan (2 , 4) , K. Clark (5 , 11)

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I. Coulter (6) F. Descamps (7) E. Falk (5) L. Gurriana (2) C. Kraus (4) G. Lefeuvre (5) A. Maio (2 8 9) J. Maneira (2 8) M. Mottram (5) S. Peeters (5) J. Rose (10) L. Seabra (2) J. Sinclair (5) P. Skensved (11) J. Waterfield (5) R. White (5) J. R. Wilson (12) ((1) LIP University Coimbra Portugal (2) LIP Lisboa (3) University of Leeds UK (4) Laurentian University Sudbury Canada (5) University of Sussex Brighton (6) Oxford University (7) LBNL Berkeley USA (8) FCUL University of Lisbon (9) CFNUL (10) University of Liverpool (11) Queen's University Kingston (12) Queen Mary University of London UK)

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classification ⚛️ physics.ins-det hep-ex

keywords systemcalibrationexperimentlightphotomultiplierarraycommissioningdesign

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A light injection system using LEDs and optical fibres was designed for the calibration and monitoring of the photomultiplier array of the SNO+ experiment at SNOLAB. Large volume, non-segmented, low-background detectors for rare event physics, such as the multi-purpose SNO+ experiment, need a calibration system that allow an accurate and regular measurement of the performance parameters of their photomultiplier arrays, while minimising the risk of radioactivity ingress. The design implemented for SNO+ uses a set of optical fibres to inject light pulses from external LEDs into the detector. The design, fabrication and installation of this light injection system, as well as the first commissioning tests, are described in this paper. Monte Carlo simulations were compared with the commissioning test results, confirming that the system meets the performance requirements.

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The calibration system for the photomultiplier array of the SNO+ experiment

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