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SUMMARY:R&D and characterization of wavelength-shifting reflectors for LEG
 END-200 and for future LAr-based detectors
DTSTART;VALUE=DATE-TIME:20210917T154500Z
DTEND;VALUE=DATE-TIME:20210917T160000Z
DTSTAMP;VALUE=DATE-TIME:20260606T143927Z
UID:indico-contribution-34@indico.physics.ucsd.edu
DESCRIPTION:Speakers: Gabriela Rodrigues Araujo (University of Zurich)\nTh
 e new design of the LAr veto of the LEGEND-200 neutrinoless double beta de
 cay experiment\, as well as many other LAr-based detectors\, require mater
 ials that can efficiently shift VUV light to the visible range while being
  reflective to visible light. For the LAr veto of LEGEND-200\, 14 square m
 eters of the reflector Tetratex (TTX) were coated in-situ with tetraphenyl
  butadiene (TPB). For even larger detectors\, TPB coating becomes  more ch
 allenging and plastic films of polyethylene naphthalate (PEN) could be an 
 option to ease scalability. In this context\, we characterized the specifi
 c sample of the  wavelength-shifting reflector (WLSR) from LEGEND-200 and 
 investigated the light yield from the combination of a PEN film with the r
 eflector TTX. Samples from both WLSRs were measured with spectrophotometer
 s\, observed with a microscope\, and then characterized in a LAr setup equ
 ipped with a VUV sensitive photomultiplier. Parameters such as the reflect
 ance\, absorption length and light yield of the samples (as well as of the
  setup and its materials) were measured\,  such that the intrinsic quantum
  efficiency of PEN and TPB in LAr (at 87K) could be estimated.\n\nhttps://
 indico.physics.ucsd.edu/event/1/contributions/34/
LOCATION:
URL:https://indico.physics.ucsd.edu/event/1/contributions/34/
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