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The photon detection system for the LHCb RICH Upgrade consists of an array ofmultianode photomultiplier tubes (MaPMTs) read out by custom-built modularelectronics. The behaviour of the whole chain was studied at CERN using apulsed laser. Threshold scans were performed in order to study the MaPMTpulse-height spectra at high event rates and different photon intensities. Theresults 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 theevent rate from 100 kHz to 20 MHz. This reduction was not observed at 1000 Vbias voltage.

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