Radiation hard scintillating fibre tracker development for LHCb Upgrade II

by Federico Ronchetti (EPFL)

Tuesday 22 Sept 2026, 10:00 → 11:00 Europe/Berlin

CP-03-144 (TUDortmund)

The LHCb collaboration at CERN studies heavy-flavour hadrons produced at the Large Hadron Collider. For the Upgrade II of the LHCb detector, foreseen to operate from 2036 in LHC Run 5, the current Scintillating-Fibre (SciFi) tracker will be replaced by the Mighty Tracker, combining silicon pixels in the innermost region and scintillating fibres in the outer region. In this environment, higher radiation levels and occupancies require improved scintillating-fibre technology with enhanced light collection, timing performance, and radiation tolerance. This talk focuses on the development and characterisation of silicon photomultipliers (SiPMs) for the Mighty SciFi detector. In particular, microlens arrays have been designed and optimised using dedicated optical simulations and subsequently implemented on customised SiPM arrays to enhance the photodetector response in terms of photon detector efficiency and timing. The performance of 2.4m long scintillating-fibre mats read out with conventional and microlens-enhanced SiPMs has been studied in test-beam campaigns at CERN. In addition, the radiation-induced increase in dark count rate of all 4096 SiPMs installed in the current LHCb SciFi Tracker has been monitored during LHC Run 3 to assess the radiation damage of the SiPMs and confirm the expectations of the R&D phase. These measurements validate the expected radiation-damage behaviour and provide input for future detector operation and performance studies.

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SeminarDortmund.pdf