Speaker
Description
High-granularity calorimeters demand highly compact detection units to achieve precise energy measurements. However, the severe geometric mismatch exists between large scintillator tiles and small Silicon Photomultipliers (SiPMs) leads to degraded light collection efficiency (LCE) and non-uniform spatial response, which fundamentally limits the calorimeter's energy resolution. The use of photonic crystal, metalens, or conventional light guide design cannot overcome this bottleneck without significantly raise the cost of the calorimeter or introducing unacceptable dead zones.
To address this critical challenge, we propose a novel compact Periscopic Light Guide (PLG) design. This innovative approach can effectively guide scintillation photons through a periscopic optical path to the coupled SiPM. The PLG has extremely small footprint, and requiring no modifications to the existing scintillators or SiPMs.
In this work, we present the design and optical simulation result acquired with Geant4 of the proposed PLG. The simulation results demonstrate a more than 2-fold increase in light collection efficiency compared to the standard direct coupling scheme, alongside a significant improvement in the spatial response uniformity across the scintillator tile. These results validate the feasibility of the periscopic design in mitigating geometric mismatch for high-granularity calorimeter. Future work will focus on prototype fabrication, experimental validation, and iterative design optimization to further mature this technology for suitable applications.
