The OPERA global readout and GPS distribution system
J. Marteau (IPNL)

TL;DR
The paper describes the design and implementation of a sophisticated, synchronized, and distributed readout and GPS timing system for the OPERA neutrino oscillation experiment, enabling precise data collection and event synchronization.
Contribution
It introduces a novel global readout architecture using Ethernet-capable sensors and a GPS-locked clock system for large-scale particle physics experiments.
Findings
Successful deployment of a triggerless, continuous readout system.
Precise synchronization of all detector channels via GPS.
Enhanced data acquisition reliability and timing accuracy.
Abstract
OPERA is an experiment dedicated to the observation of into oscillations in appearance mode using a pure beam (CNGS) produced at CERN and detected at Gran Sasso. The experiment exploits a hybrid technology with emulsions and electronics detectors \cite{opera}. The OPERA readout is performed through a triggerless, continuously running, distributed and highly available system. Its global architecture is based on Ethernet-capable smart sensors with microprocessing and network interface directly at the front-end stage. An unique interface board is used for the full detector reading out ADC-, TDC- or Controller-boards. All the readout channels are synchronized through a GPS-locked common bidirectional clock distribution system developped on purpose in a PCI format. It offers a second line to address all channels and the off-line synchronization with the CNGS to…
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