Measuring the Attenuation Length of Water in the CHIPS-M Water Cherenkov Detector
F.Amat, P.Bizouard, J.Bryant, T.J.Carroll, S.De Rijck, S.Germani,, T.Joyce, B.Kreisten, M.Marshak, J.Meier, J.Nelson, A.J.Perch, M.M.Pfuzner,, R.Salazar, J.Thomas, J.Trokan-Tenorio, P.Vahle, R.Wade, C.Wendt,, L.H.Whitehead, M.Whitney
TL;DR
This study measures the water's attenuation length for Cherenkov light in the CHIPS detector, showing that filtered and UV-sterilized water can achieve attenuation lengths up to 100 meters, which is crucial for detector performance.
Contribution
It provides the first measurement of water attenuation length at the CHIPS site, demonstrating effective filtration and sterilization methods to achieve long attenuation lengths.
Findings
Attenuation lengths up to 100 meters were observed.
Filtration and UV sterilization effectively improve water clarity.
Results support the feasibility of using this water for Cherenkov detection.
Abstract
The water at the proposed site of the CHIPS water Cherenkov detector has been studied to measure its attenuation length for Cherenkov light as a function of filtering time. A scaled model of the CHIPS detector filled with water from the Wentworth 2W pit, proposed site of the CHIPS deployment, in conjunction with a 3.2\unit{m} vertical column filled with this water, was used to study the transmission of 405nm laser light. Results consistent with attenuation lengths of up to 100m were observed for this wavelength with filtration and UV sterilization alone.
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