Speaker
Paolo Musico
(Universita e INFN (IT))
Description
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))
Co-author
of on behalf
(KM3NeT Collaboration)
