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The ARAPUCA device and its impact on the sensitivity of dune far detector for low energy events

Grant number: 18/18544-0
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): November 01, 2018
Effective date (End): April 30, 2019
Field of knowledge:Physical Sciences and Mathematics - Physics
Principal Investigator:Ettore Segreto
Grantee:Kanishka Rawat
Home Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated research grant:14/19164-6 - Challenges in the 21st century in neutrino physics and astrophysics, AP.TEM

Abstract

The DUNE experimental group at UNICAMP conceived a new concept for detecting liquid argon (LAr) scintillation light in large LAr Time Projection Chambers (TPC) like those foreseen for the far detector of the DUNE experiment. This new device, called ARAPUCA (Argon R & D Advanced Program at UNICAMP), is based on the use of a specific optical filter (a dichroic filter) and of a smart technique of wave-shifting the scintillation light, which allows to trap light inside a box with extremely reflective internal surfaces. Trapped photons are detected by photo-sensitive silicon devices after few reflections. The ARAPUCA has the potentiality of increasing the light detection efficiency of the detector by an order of magnitude with significant impact on the sensitivities for low energy events, like proton decay and supernovae neutrinos. This project is intended for an experimentalist with hardware and software skills, which can contribute to the development of the ARAPUCA in the improvement of its efficiency and should be able, in collaboration with the theoretical group, to estimate how these improvements benefits the sensitivities of the detector.