The laser calibration system of the TOP detector

M. Benettoni; A. Gaz; S. Lacaprara; M. Posocco; P. Sartori; R. Stroili; E. Torassa; R. Mussa; U. Tamponi

doi:10.1117/12.2194350

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29 July 2015 The laser calibration system of the TOP detector

M. Benettoni, A. Gaz, S. Lacaprara, M. Posocco, P. Sartori, R. Stroili, E. Torassa, R. Mussa, U. Tamponi

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Proceedings Volume 9659, International Conference on Photonics Solutions 2015; 96590C (2015) https://doi.org/10.1117/12.2194350
Event: International Conference on Photonics Solutions 2015, 2015, Hua Hin, Thailand

Abstract

The TOP detector at the Belle II Experiment is a particle identification detector, devoted mainly to the separation of charged pions and kaons. The charged particles emit Cherenkov photons when traversing a quartz radiator and these photons are converted inside micro-channel plates photomultipliers. The time of arrival and position of the photoelectrons, detected with excellent spatial and time resolution, are used to reconstruct the angle of the Cherenkov light emitted by the charged particle. The monitoring of the time stability and the measurement of the quantum efficiency of the photomultipliers are performed with a laser calibration system, with a target time resolution better than 50 ps. The system is a combination of a picosecond laser source, long single mode fibers, fiber bundles, and microlenses, which are needed to illuminate all the channels of the photomultipliers. A detailed description of the laser calibration system and its properties is given.

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M. Benettoni, A. Gaz, S. Lacaprara, M. Posocco, P. Sartori, R. Stroili, E. Torassa, R. Mussa, and U. Tamponi "The laser calibration system of the TOP detector", Proc. SPIE 9659, International Conference on Photonics Solutions 2015, 96590C (29 July 2015); https://doi.org/10.1117/12.2194350

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