Abstract

The KM3NeT European project aims at constructing a km3 underwater neutrino telescope in the depths of the Mediterranean Sea. The first phase that is under construction will comprise eight tower-like detection structures (KM3NeT-Italia), which will form the internal core of a km3 -scale detector. The detection element of KM3NeT-Italia, the optical module, is made of a 13-inch pressure-resistant glass-vessel that contains a single 10-inch photomultiplier and the relative electronics. The design of the whole optical module, the main results obtained from the massive photomultipliers measurements, and the foremost phases of the mass production procedure performed at the production site of Catania are also presented.

Highlights

  • The KM3NeT European project aims at constructing a km3 underwater neutrino telescope in the depths of the Mediterranean Sea

  • The design of the whole optical module, the main results obtained from the massive photomultipliers measurements, and the foremost phases of the mass production procedure performed at the production site of Catania are presented

  • The PMTs that fully complied with the requirements were assembled into the optical modules; – the high voltage (HV) base and the leads of each PMT were covered with a liquid coating

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Summary

Introduction

The KM3NeT European project aims at constructing a km underwater neutrino telescope in the depths of the Mediterranean Sea. Thanks to a dedicated funding by the Italian Ministry of Education, University and Research (MIUR) the construction of a first phase of the Italian KM3NeT node is under way. Thanks to a dedicated funding by the Italian Ministry of Education, University and Research (MIUR) the construction of a first phase of the Italian KM3NeT node is under way This detector will comprise eight tower-like detection units and 24 strings. The detection element of the telescope, called optical module (OM), is a pressure-resistant transparent glass vessel that contains a 10 photomultiplier and the electronics devices for power supply, signal read-out and transmission.

The optical module design
The photomultiplier characterization phase
Aging effects
The Earth’s magnetic field effects on PMTs
The main phases of the production procedure
Findings
Conclusions

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