Enhancing photon counters in cryostats for CERN’s Large Hadron Collider upgrade
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Author
Zanella, F.
Schneider, C.
Morales, N.
Basset, G.
DOI
Abstract
Microlens arrays (MLAs) are widely used to control and homogenize optical beams in demanding photonic systems. In solid-state photon detectors, MLAs improve the effective fill factor by redirecting incoming photons toward active areas, thereby increasing the photo detection efficiency (PDE). We report the integration of MLAs on silicon photomultipliers (SiPMs) developed for CERN’s LHCb Scintillating Fiber Tracker (SciFi) at the Large Hadron Collider (LHC). The integration demonstrates significant PDE enhancement, reduced optical crosstalk, and improved single-photon timing resolution (SPTR). Importantly, stable performance gains are preserved down to cryogenic temperatures of 77 K. Leveraging CSEM’s MLA foundry services, this work highlights a scalable and robust solution for next-generation photon detectors operating in extreme environments.
Publication Reference
CSEM Scientific and Technical Report 2025, p. 55–56
Year
2025