Simulations of photon propagation in scintillation detectors were performedwith the aim to find the optimal scintillator geometry, surface treatment, andshape of external reflector in order to achieve maximum light collectionefficiency for detector configurations that avoid direct optical coupling, asituation that is commonly found in cryogenic scintillating bolometers inexperimental searches for double beta decay and dark matter. To evaluate thelight collection efficiency of various geometrical configurations we used theZEMAX ray-tracing software. It was found that scintillators in the shape of atriangular prism with an external mirror shaped as truncated cone gives thehighest light collection efficiency. The results of the simulations wereconfirmed by carrying out measurements of the light collection efficiencies ofCaWO4 crystal scintillators. A comparison of simulated and measured values oflight output shows good agreement
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