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SUMMARY:Measurements of the X-Arapuca single-cell light detection efficien
 cy.
DTSTART;VALUE=DATE-TIME:20210915T160000Z
DTEND;VALUE=DATE-TIME:20210915T170000Z
DTSTAMP;VALUE=DATE-TIME:20260306T110344Z
UID:indico-contribution-44@indico.physics.ucsd.edu
DESCRIPTION:Speakers: Henrique Souza (University of Campinas)\, Ettore Seg
 reto (Unicamp)\nThe X-Arapuca (XA) supercell is the basic unit of the Phot
 on Detection System (PDS) of the Deep Underground Neutrino Experiment (DUN
 E). In total\, 1\,500 X-Arapuca with approximate dimensions of 210 x 12 cm
 $^2$ will be installed on the anode planes of the liquid argon time projec
 tion chamber (LArTPC). In the XA light trap device\, the liquid argon scin
 tillation light (with wavelength around 127 nm) is absorbed by a thin laye
 r of para-Terphenyl (pTP) coated on a dichroic filter window which constit
 utes its acceptance window. PTP re-emits photons around 350 nm\, above the
  filter cutoff. The light which enters the XA is downshifted again by the 
 inner wavelength shifter plate (WLS plate) to a wavelength around 430 nm. 
 The cut-off of the dichroic filter is placed at 400 nm: this allows the pT
 P shifted light to enter in the X-Arapuca and to trap the fraction of phot
 ons which escape from total internal reflection in the WLS plate. The ligh
 t is collected by an array of silicon photo-sensors (SiPM) coupled at the 
 edges of the WLS plate. In this work\, we present the first characterizati
 on of the photon detection efficiency of an X-Arapuca prototype sizing 10 
 x 7.5 cm$^2$ in Brazil\, where the X-Arapuca was exposed to alpha particle
 s\, cosmic muons and gammas in liquid argon. Operating the SiPMs at +5 and
  +5.5 V over the breakdown voltage\, an efficiency ranging from 2.2% to 2.
 3% and from 2.7% to 3.1% was found\, respectively.\n\nhttps://indico.physi
 cs.ucsd.edu/event/1/contributions/44/
LOCATION:
URL:https://indico.physics.ucsd.edu/event/1/contributions/44/
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