The Central Logic Board for the optical module of the KM3NeT detector

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Beurs van Berlage

Beurs van Berlage

Poster Experiments: 2c) Detectors for neutrino physics


Paolo Musico (Universita e INFN (IT))


The KM3NeT deep sea neutrino observatory will include a very large number of multi-Photomultiplier (PMT) optical modules (DOM) to detect the Cherenkov light generated by secondary particles produced in neutrino interactions. The Central Logic Board (CLB) has been developed to acquire timing and amplitude information from the PMT signals, implementing time-to-digital conversion (TDC) with time over threshold (TOT) technique. The board is also used to configure all the DOM subsystems, to assist in the the DOM position and orientation, calibration and to monitor temperature and humidity in the DOM itself. All the collected data are transmitted to shore using a wide-bandwidth optical network. Moreover, through the optical network, all the DOMs are kept synchronized in time within 1 ns precision using the White Rabbit (WR) Precision Time Protocol (PTP) over an Ethernet connection. To implement all these functionalities, a large Field Programmable Gate Array (FPGA) has been adopted. The logic inside the FPGA is very complex, including two microprocessor systems running concurrent code. A set of CLB prototypes is now operational, and a batch of 50 pieces has been ordered to equip the first two KM3NeT detection units (DU) which will be deployed during next year. CLB design considerations, prototyping issues and measurements made on the prototypes will be reported.

Primary author

Paolo Musico (Universita e INFN (IT))


of on behalf (KM3NeT Collaboration)

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