LIP Lisboa

Trapping light for particle detection: the X-ARAPUCA technology

by Gustavo Valdiviesso (Federal University of Alfenas Science and Technology Institute)

Seminar Room (LIP)

Seminar Room


Av. Prof. Gama Pinto, n.2 Complexo Interdisciplinar (3is) 1649-003 Lisboa Portugal

Youtube URL ::


The X-ARAPUCA is a novel technology for the detection of scintillation light, used in current liquid argon detectors. The word arapuca refers to a rudimentar bird trap built by brazilian natives, which illustrates the principle behind the X-ARAPUCA: photons are trapped inside the system, increasing the probability of detection by a silicon photomultiplier. The trapping happens due to a clever combination of wavelength shifters and a dichroic filter, designed by Ana Amelia Machado and Ettore Segreto, which deservely granted them the 2019 APS Instrumentation Early Career Award. In this presentation we explore the principles behind the X-ARAPUCA and its current application on SBND and  on DUNE's far detectors.