Optical calibration hardware for the Sudbury Neutrino Observatory

Abstract

The optical properties of the Sudbury Neutrino Observatory (SNO) heavy water Cherenkov neutrino detector are measured in situ using a light diffusing sphere ("laserball"). This diffuser is connected to a pulsed nitrogen/dye laser via specially developed underwater optical fibre umbilical cables. The umbilical cables are designed to have a small bending radius, and can be easily adapted for a variety of calibration sources in SNO. The laserball is remotely manipulated to many positions in the D2O and H2O volumes, where data at six different wavelengths are acquired. These data are analysed to determine the absorption and scattering of light in the heavy water and light water, and the angular dependence of the response of the detector's photomultiplier tubes. This paper gives details of the physical properties, construction, and optical characteristics of the laserball and its associated hardware.

17 pages, 8 figures, submitted to Nucl. Inst. Meth. A

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• Measurement of Day and Night Neutrino Energy Spectra at SNO and Constraints on Neutrino Mixing Parameters
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• The Sudbury Neutrino Observatory
• Constraints on Nucleon Decay via "Invisible" Modes from the Sudbury Neutrino Observatory
• Electron Antineutrino Search at the Sudbury Neutrino Observatory
• The 16N Calibration Source for the Sudbury Neutrino Observatory
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• The 8Li Calibration Source for the Sudbury Neutrino Obervatory

Cited by in corpus (16)

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• Measurement of the ${\nu }_e$ and Total ${}^8$B Solar Neutrino Fluxes with the Sudbury Neutrino Observatory Phase I Data Set
• The SNO+ Experiment
• Design and Construction of the DEAP-3600 Dark Matter Detector
• The Sudbury Neutrino Observatory
• Measurement of the ${\nu }_e$ and Total ${}^8$B Solar Neutrino Fluxes with the Sudbury Neutrino Observatory Phase-III Data Set
• Measurement of the Cosmic Ray and Neutrino-Induced Muon Flux at the Sudbury Neutrino Observatory
• Search for invisible modes of nucleon decay in water with the SNO+ detector
• Laser Calibration System in JUNO
• The calibration system for the photomultiplier array of the SNO+ experiment
• Optical calibration of the SNO+ detector in the water phase with deployed sources
• Performance of the 1-ton Prototype Neutrino Detector at CJPL-I
• A laserball calibration device for the SNO+ scintillator phase
• Calibration of Muon Reconstruction Algorithms Using an External Muon Tracking System at the Sudbury Neutrino Observatory
• Development of an isotropic optical light source for testing nuclear instruments
• Data-Driven Calibration of Large Liquid Detectors with Unsupervised Learning