期刊
JOURNAL OF INSTRUMENTATION
卷 10, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1748-0221/10/09/P09009
关键词
Noble liquid detectors (scintillation, ionization, double-phase); Photon detectors for UV, visible and IR photons (gas); Double-beta decay detectors; Dark Matter detectors (WIMPs, axions, etc.)
资金
- Swiss National Science Foundation (SNF) [200020-149256, 20AS21-136660]
- ITN Invisibles (Marie Curie Actions) [PITN-GA-2011-289442]
- Swiss National Science Foundation (SNF) [200020_149256, 20AS21_136660] Funding Source: Swiss National Science Foundation (SNF)
The detection of VUV scintillation light in (liquid) argon (LAr) detectors commonly includes a reflector with a fluorescent coating, converting UV photons to visible light. The light yield of these detectors depends directly on the conversion efficiency. Several coating/reflector combinations were produced using VM2000, a specular reflecting multi-layer polymer, and Tetratex (R), a diffuse reflecting PTFE fabric, as reflector foils. The light yield of these coatings was optimised and has been measured in a dedicated liquid argon setup built at the University of Zurich. It employs a small, 1.3 kg LAr cell viewed by a 3-inch, low radioactivity PMT of type R11065-10 from Hamamatsu. The cryogenic stability of these coatings was additionally studied. The optimum reflector/coating combination was found to be Tetratex (R) dip-coated with Tetraphenyl-butadiene with a thickness of 0.9 mg/cm(2), resulting in a 3.6 times higher light yield compared to uncoated VM2000. Its performance was stable in long-term measurements, performed up to 100 days in liquid argon. This coated reflector was also investigated concerning radioactive impurities and found to be suitable for current and upcoming low-background experiments. Therefore it is used for the liquid argon veto in Phase II of the GERDA neutrinoless double beta decay experiment.
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