Crilin: A novel calorimeter proposal for the s=10 TeV Muon Collider — Simulations and prototype tests results

Among the Future Collider proposals the Muon Collider offers unique advantages for advancing research at the energy frontier. However, the beam induced background (BIB), from muon decays the collider ring, poses a significant challenge for detector design and event reconstruction. Despite the use of tungsten conical absorbers in the forward regions, an irreducible component of BIB enters the detector, characterized by low momentum and out-of-time arrival component respect the bunch crossing. The BIB flux on the barrel inner face of the electromagnetic calorimeter is about 300 particles per cm2, with a total ionizing dose of 10 kGy/y and a neutron fluence of 1014n1 MeVcm−2y−1. To mitigate BIB effects, innovative solutions are needed. One promising development is Crilin (CRystal calorImeter with Longitudinal INformation), a semi-homogeneous electromagnetic calorimeter based on lead fluoride crystals (PbF2) read by UV-extended silicon photomultipliers. This novel calorimeter proposal, featuring high granularity, longitudinal segmentation and excellent expected timing, offers the potential to mitigate BIB effects and achieve a high energy resolution (less than 10%/E[GeV]. This paper will present simulation results on the performance of Crilin and recent experimental test results from Crilin prototype, highlighting its potential in the challenging Muon Collider environment.