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
In hopes of understanding the universe we inhabit, scientists search for signals from the universe that could give as clues about its nature. When these signals are composed of particles, they are...Show moreIn hopes of understanding the universe we inhabit, scientists search for signals from the universe that could give as clues about its nature. When these signals are composed of particles, they are given the name of ”cosmic rays”. Once cosmic rays have reached our atmosphere, they interact with molecules there, creating pions and kaons that decay into muons and neutrinos. Studying these, we can deepen our knowledge and understanding of the universe. It is in the interest of this that this thesis explores the effect of seasonal changes in temperature on the rate of atmospheric muons that reaches the ARCA site of KM3NeT, a neutrino telescope being built in the Mediterranean sea. Exploiting their depth dependence we were able to establish a new method to quantify a muon rate, allowing the investigation of different energy ranges through the filtering of certain coincidences. After fitting these curves to an exponential decay, the fit parameters were extracted and compared to the temperatures in different pressure levels of the atmosphere. This showed a weak negative correlation for the normalization factor and a moderate positive correlation for the slope. For lower energies, the relationship between the slope and temperature was proportional by a factor αT = 0.0029 ± 0.00012. For higher energies, this proportionality was given by αT = 0.0051 ± 0.00034. Due to the weak correlation exhibited, no constant of proportionality was found for the normalization factor.Show less
