KM3NeT is a European research infrastructure hosting the new generation of neutrino telescopes. It is currently under construction and consists of two detectors. This report investigates data from...Show moreKM3NeT is a European research infrastructure hosting the new generation of neutrino telescopes. It is currently under construction and consists of two detectors. This report investigates data from six already deployed units of the ORCA detector to provide a characterisation of the detector efficiencies. The isotropic efficiencies used in the Monte Carlo simulation and estimated from 40K decays are compared to anisotropic efficiency measures based on light created by muons. Shadowing effects are shown to create a bias of approximately 5% in the detected number of photons. The simulation underestimates the amount of direct light and overestimates the amount of indirect light. The latter is likely the result of an overestimation of the muon bundle multiplicity. A comparison between the reference simulation and one that assumes 5% more absorption shows a preference for more absorption for larger distances and time residuals.Show less
This research paper presents the investigations on the impact of Earth’s magnetic field on the efficiency of 3-inch photomultiplier tubes used in the KM3NeT neutrino telescope. The research...Show moreThis research paper presents the investigations on the impact of Earth’s magnetic field on the efficiency of 3-inch photomultiplier tubes used in the KM3NeT neutrino telescope. The research includes measurements of three Hamamatsu PMTs. The measurements show that the efficiency of the PMTs are directional-dependent. However, this significance is most probably not caused by Earth’s magnetic field only. Further investigation is needed to determine where these external effects come from.Show less
This thesis studies the origin of large signals detected in the KM3NeT optical modules. The origin of the signals is directly studied with the single PMT and indirectly with the DOM. The results of...Show moreThis thesis studies the origin of large signals detected in the KM3NeT optical modules. The origin of the signals is directly studied with the single PMT and indirectly with the DOM. The results of both the single PMT and the DOM point toward a high energetic particle origin. Further measurements are required to conclude this with certainty.Show less
