Abstract
The STRings for Absorption length in Water (STRAW) are the first in a series of pathfinders for the Pacific Ocean Neutrino Experiment (P-ONE), a future large-scale neutrino telescope in the north-eastern Pacific Ocean. STRAW consists of two 150,mathrm {m} long mooring lines instrumented with optical emitters and detectors. The pathfinder is designed to measure the attenuation length of the water and perform a long-term assessment of the optical background at the future P-ONE site. After 2 years of continuous operation, measurements from STRAW show an optical attenuation length of about 28 m at 450,mathrm {nm}. Additionally, the data allow a study of the ambient undersea background. The overall optical environment reported here is comparable to other deep-water neutrino telescopes and qualifies the site for the deployment of P-ONE.
Highlights
Northern Pacific Ocean that will complement the sky coverage of other neutrino telescopes [1]
The development of PONE is possible thanks to Ocean Networks Canada (ONC), a Canadian ocean research observing facility hosted at the University of Victoria, that operates various undersea sensors and data transmission networks [2]
As a precursor to Pacific Ocean Neutrino Experiment (P-ONE), a pathfinder known as STRAW (STRings for Absorption length in Water) was developed and deployed in 2018 to measure the optical properties of the Cascadia Basin water as well as the ambient light levels [3]
Summary
Northern Pacific Ocean that will complement the sky coverage of other neutrino telescopes [1]. As a precursor to P-ONE, a pathfinder known as STRAW (STRings for Absorption length in Water) was developed and deployed in 2018 to measure the optical properties of the Cascadia Basin water as well as the ambient light levels [3]. The optical attenuation length of the water at different wavelengths is extracted from the data and the ambient light levels from radioactive potassium decay and bioluminescence are discussed. The PMTs are read out by a time-to-digital converter that uses the Trigger Readout Board (TRB3sc) developed by the German heavy ion research centre GSI [6] This readout system allows the detectors to run in two different modes of operation. The primary analysis of this paper is concerned with the optical attenuation length of the seawater which takes both scattering and absorption into account. It should be noted that different experiments use slightly different definitions of the attenuation length, which must be taken into account when making comparisons
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