Development of a liquid argon detector with high light collection efficiency using tetraphenyl butadiene and a silicon photomultiplier array

Kazutaka Aoyama*, Masashi Tanaka, Masato Kimura, Kohei Yorita

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

To increase the light collection efficiency of a liquid argon (LAr) detector, we optimized the evaporation technique of tetraphenyl butadiene (TPB) on the detector surface and tested the operability of a silicon photomultiplier at LAr temperature. TPB converts LAr scintillations (vacuum ultraviolet light) to visible light, which can be detected using high-sensitivity photosensors. Because the light collection efficiency depends on the deposition mass of TPB on the inner surface of the detector, we constructed a well-controlled TPB evaporator to ensure reproducibility and measured the TPB deposition mass using a quartz crystal microbalance sensor. After optimizing the deposition mass of TPB (30 rm μ g/cm2 on the photosensor window and 42 rm μ g/cm 2 on the detector wall), the observed light yield was 12.8 ± 0.3 p.e./keVee using photomultiplier tubes with a quantum efficiency of approximately 30% for TPB-converted light. We also tested the low-temperature tolerance of the silicon photomultiplier, which has a high photon detection efficiency, in a LAr environment. It detected the LAr scintillations converted by TPB with a photon detection efficiency exceeding 50%.

Original languageEnglish
Article number043H01
JournalProgress of Theoretical and Experimental Physics
Volume2022
Issue number4
DOIs
Publication statusPublished - 2022 Apr 1

Keywords

  • F40
  • H20
  • H21
  • H22

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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