Synthesis of Junction Box Quality Assurance for KM3NeT-ARCA Neutrino Detector

The KM3NeT-ARCA neutrino detector is the largest underwater neutrino telescope operating in the Mediterranean Sea at a depth of 3500 m, 100 km off the coast of Portopalo di Capo Passero (Italy). It is composed of strings anchored in the deep sea and kept vertical using a buoy. Each string hosts 18 Digital Optical Modules (DOMs), containing 31 optical sensors. The entire telescope, once completed, will be composed of 230 identical strings named Detection Units (DUs) that will send data to shore in real time. A Junction Box (JB) and an electro-optical cable permit the connection to the shore and the powering of the entire system. Each JB connects to the shore, handling up to12 strings. It is a critical element that requires strict quality assurance rules. This article will focus on the quality assurance process that has allowed the JB to be a robust and reliable element of the entire KM3NeT-ARCA background network.