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The ARAPUCA concept has been developed by UNICAMP members (see A.A. Machado and E. Segreto, 2016 JINST 11 C02004.) and is currently carried on by a group that brings together scientists from Brazil (UNICAMP, UFABC, UFSCAR, UNIFAL), Indiana University, and Fermilab. It is a device expected to improve the scintillation light efficiency detection in liquid argon.
It is a box made of highly reflective internal surface material and with an acceptance window for photons composed of two shifters and a dichroic filter. The first shifter converts the LAr scintillation light (~127 nm) to a photon of wavelength smaller than the dichroic cutoff, so the surface is highly transparent to it. When passing through the dichroic filter, it reaches the second shifter which allows the photon to be shifted to the visible region (~450 nm) and be detected by the SiPM nested inside it. When it enters the box, the photon will likely reflect a few times (including on the dichroic filter surface, now highly reflective to the light because of the longer wavelength) before being detected.
The ARAPUCA simulation group, composed by professors Franciole Marinho, Ana Machado, Ettore Segreto and Laura Paulucci, is working to completely characterize the device using Monte Carlo simulations.
On the left, pictorial representation of the ARAPUCA design. On the right, its operating principle is shown in detail for direct light detection. Image from A.A. Machado and E. Segreto, 2016 JINST 11 C02004.
Lateral view of the simulated ARAPUCA device on the left and rotated view on the right using Geant4. The SiPM is located on the upper lateral (blue) and the box is made of highly reflective teflon (gray). Photons are shown as (green) lines.
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