Simulation of Optical Parameters of Scintillation Position-Sensitive Detectors with Organic Light Guide

A new method for determining the coordinates in position-sensitive detectors with an organic fiber and silicon photomultipliers is described. This method differs from previously used spectrum-shifting fibers or an array of light-sensitive elements. It is based on the absorption of photons in the volume of the fiber and the reduction in the number of photons. Depending on the path length, the number of photons incident on the surface of the silicon photomultiplier varies. The optical parameters of a one-dimensional position-sensitive detector are simulated and the effect of the fiber coating on the amount of light is shown. Simulation of a two-dimensional position-sensitive detector of two types has been also carried out, optical parameters and intensity ratios from different ends of the fiber have been determined. A technique for obtaining maps of intensity ratios and features of their use for determining the coordinates are described. The main features of the manufacture of this type detectors and their influence on the resolution of the final detector are outlined.