Geiger Mode APD performance in a cryogenic two-phase Ar avalanche detector based on THGEMs

Mar, 2010
4 pages
Published in:
  • Nucl.Instrum.Meth.A 628 (2011) 364-368
Contribution to:
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Abstract: (arXiv)
Characteristic properties of a Geiger Mode APD (G-APD) in a THGEM-based cryogenic two-phase Ar avalanche detector were studied in view of potential applications in rare-event experiments. G-APD signal amplitude and noise characteristics at cryogenic temperatures turned out to be superior to those at room temperature. The effective detection of avalanche scintillations from THGEM-multiplier holes in two-phase Ar has been demonstrated using a G-APD without wavelength shifter. At an avalanche gain of 60, the avalanche scintillation yield measured by the G-APD was as high as 0.9 photoelectrons per avalanche electron, extrapolated to 4pi acceptance.
Note:
  • 4 pages, 8 figures. Presented at Vienna Conference on Instrumentation (Feb 15-20, 2010, Vienna, Austria). Submitted to the Proceedings
  • 29.40.Cs
  • 34.80.My
  • Cryogenic two-phase avalanche detectors
  • Geiger mode APD
  • Gas electron multipliers
  • Thick GEMs