Speaker
Description
The Deep Underground Neutrino Experiment (DUNE) is a next-generation long-baseline neutrino experiment designed to study neutrino oscillations, neutrino mass ordering, and CP violation using large liquid-argon time projection chambers (LArTPCs). Currently, a prototype of a new photodetection system, called PoWER, is under development and may contribute to the DUNE experiment by enabling the determination of whether events occurred in the active volume or in the external (buffer) volume of the detector. The objective of this work is to understand how the position of the radioactive source affects light collection by the silicon photomultipliers (SiPMs), enabling analysis of the detector’s behavior across different regions. We performed a Geant4 simulation of the prototype using an alpha-particle source placed at several positions. We obtained the veto as the ratio of vacuum ultraviolet (VUV) to total light collection by the SiPMs. With the source in the inner region, we obtained a veto value of 0.14, and in the outer region, it ranged from 0.72 to 1.0.
These results agree with the fact that in the buffer zone, light is not converted to visible light. The simulation shows that it is possible to identify whether the source was inside or outside the inner chamber.
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