Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2005-07-19
Nucl.Instrum.Meth. A554 (2005) 255-265
Physics
Nuclear Physics
Nuclear Experiment
17 pages, 8 figures, submitted to Nucl. Inst. Meth. A
Scientific paper
10.1016/j.nima.2005.08.029
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.
Duncan F. A.
Ford Richard James
Graham Keith
Grant Douglas R.
Hallin A. L.
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