The light collection of several fiber configurations embedded in a box-shaped plastic scintillating counter was studied by scanning with minimum ionizing electrons. The light was read out by silicon photomultipliers at both ends. The light yield produced by the 855-MeV beam of the Mainz Microtron showed a strong dependence on the transverse distance from the beam position to the fibers. The observations were modeled by attributing the collection of indirect light inside of the counter and of direct light reaching a fiber to the total light yield. The light collection with fibers was compared to that of a scintillating counter without fibers. These studies were carried out within the development of plastic scintillating detectors as an active veto system for the DarkMESA electron beam-dump experiment that will search for light dark matter particles in the MeV mass range.

通过用最少的电离电子进行扫描，研究了嵌入盒形塑料闪烁计数器中的几种光纤配置的光收集。光由两端的硅光电倍增管读出。Mainz Microtron 的 855-MeV 光束产生的光产额显示出强烈依赖于从光束位置到光纤的横向距离。通过将计数器内部的间接光和到达光纤的直接光的收集归因于总光输出来模拟观察结果。将使用纤维的光收集与没有纤维的闪烁计数器的光收集进行比较。