Speaker
Description
Glass scintillators (GS) are considered for calorimeters in future experiments. SiPM is often chosen for the readout. A lightguide is needed to match the SiPM sensitive area to the surface(s) of the scintillator. In some detector designs, especially those with high granularity readout cells, there is little room for a traditional lightguide. For example, in the CEPC HCAL the current thinking is to couple 1, 2 or 4 SiPMs with a 40 mm x 40 mm x 10 mm GS tile. With 1 SiPM for 1 tile, the detector suffers from uneven and low-light collection. While the scheme of 4 SiPMs for 1 tile mitigates the problem, it greatly increases the cost for the readout electronics. We propose a novel lightguide design that wraps up the scintillator, taking up very little room between tiles. With strategically placed light coupling locations, this lightguide evens out the light collection, while increasing the efficiency for the scheme of 1 SiPM for 1 tile. Manufacturability and installation schemes are also taken into account for cost considerations. GEANT4 based simulation results will be presented at ICHEP, while we strive to obtain measurement results of a small prototype asap.
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