July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Time synchronization and time calibration in KM3NeT

Jul 30, 2015, 3:30 PM
1h
Amazon Foyer Terrace (World Forum)

Amazon Foyer Terrace

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 276
Poster contribution NU-IN Poster 1 DM and NU

Speaker

Dr Mieke Bouwhuis (NIKHEF)

Description

The KM3NeT neutrino telescope is a next generation Cherenkov array containing thousands of optical modules being installed in deep sea at a depth larger than 2500 m and more than 40 km distance from the shore. For the precise event reconstruction sub-nanosecond precision synchronization between modules is required. Its realization exploits the White Rabbit system to synchronize clocks between nodes through Ethernet over optical fiber. This system was modified for the KM3NeT architecture that is designed for clock distribution based on a common broadcast line. The calibration procedure for electronics latencies, fiber path asymmetries and wavelength dependent light velocity on fiber is described. LED beacons installed on optical modules, laser beacons at the sea bottom and K40 decays are also used to monitor the detector time synchronization in situ. Application of the time calibration procedure to the first detection unit string with 18 optical modules and it performance will be presented.
Registration number following "ICRC2015-I/" 1291
Collaboration KM3NeT

Primary author

Dr Mieke Bouwhuis (NIKHEF)

Co-authors

Presentation materials

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