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High rate tests of the photon detection system for the LHCb RICH Upgrade

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arxiv 1801.02623 v1 pith:HCWGUNZH submitted 2018-01-08 physics.ins-det hep-ex

Michele Piero Blago , Floris Keizer This is my paper · ORCID
classification physics.ins-dethep-ex
keywords photondetectionbiaseventhighlhcbratereduction
verification ladder T0 review T1 audit T2 compute T3 formal

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The photon detection system for the LHCb RICH Upgrade consists of an array of multianode photomultiplier tubes (MaPMTs) read out by custom-built modular electronics. The behaviour of the whole chain was studied at CERN using a pulsed laser. Threshold scans were performed in order to study the MaPMT pulse-height spectra at high event rates and different photon intensities. The results show a reduction in photon detection efficiency at 900 V bias voltage, marked by a 20 % decrease in the single-photon peak height, when increasing the event rate from 100 kHz to 20 MHz. This reduction was not observed at 1000 V bias voltage.

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