The KM3NeT neutrino telescope, located presently at two different sites in the Mediterranean Sea, consists of two neutrino detecors As the telescope is still being built, the calibration is fully...Show moreThe KM3NeT neutrino telescope, located presently at two different sites in the Mediterranean Sea, consists of two neutrino detecors As the telescope is still being built, the calibration is fully underway. This research focuses on four potential biases present in the astrophysical focused part of the detector, ARCA. Muon light, both detected and reconstructed from simulations and $^{40}$K decay being used to determine the size of those biases. It is found that the PMTs shadowed by the titanium collar on the DOM show a different bias dependent on what hemisphere they are located. Furthermore it is found that the different gel transperacy in the DOMs causes different efficiencies, and that the new PMTs show lower efficiencies than the old PMTs.Show less
KM3NeT is an international collaboration currently engaged in the development of a neutrino detector situated in the Mediterranean Sea. By investigating atmospheric neutrinos, its objective is to...Show moreKM3NeT is an international collaboration currently engaged in the development of a neutrino detector situated in the Mediterranean Sea. By investigating atmospheric neutrinos, its objective is to explore the fundamental characteristics of neutrinos, while also striving to study astro-particle physics by detecting high-energy neutrinos originating from celestial objects. Neutrinos interacting with seawater surrounding the detector create muons that emit Cherenkov radiation that can be detected. The reconstruction software employed aims to determine the energy and direction of these muons. This thesis briefly studies the underlying model, referred to as the PDF, shedding qualitative light on some of its internal mechanisms. The reconstruction software comprises a prefit stage and a fit of the PDF. In the second part of this thesis, the watershed algorithm is shown to be a promising alternative in the determination of the best distinct solutions of the prefit by effectively discerning symmetries among other considerations.Show less
The KM3NeT detector is a neutrino telescope under construction in the Mediterranean Sea. High-energy particles travelling at great velocities can emit underwater light, which is measured by the...Show moreThe KM3NeT detector is a neutrino telescope under construction in the Mediterranean Sea. High-energy particles travelling at great velocities can emit underwater light, which is measured by the detector. Data coming from the parts that are already deployed can be interpreted and analysed to determine characteristics of these incident particles. Muons are of particular interest in this research, because they can be easily identified as such. Nearly all muons approach the detector from above and, as it spans well over 600 m in length, muons are measured at different depths. Because of the large volume of sea water between the highest and the lowest part of the detector, it is expected that more muons are measured at the top than at the bottom. In a few separate ways it has been shown that this is indeed the case. Fewer hits are measured deeper down the detector, which means that the muon hit rate is dependent of the depth. It has been demonstrated that the distance over which the muon intensity halves is equal to 530 m. Comparing the data with Monte Carlo simulations has shown good agreement.Show less
