10 research outputs found
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Cryogenic Characterization of FBK RGB-HD SiPMs
We report on the cryogenic characterization of Red Green Blue - High Density
(RGB-HD) SiPMs developed at Fondazione Bruno Kessler (FBK) as part of the
DarkSide program of dark matter searches with liquid argon time projection
chambers. A dedicated setup was used to measure the primary dark noise, the
correlated noise, and the gain of the SiPMs at varying temperatures. A
custom-made data acquisition system and analysis software were used to
precisely characterize these parameters. We demonstrate that FBK RGB-HD SiPMs
with low quenching resistance (RGB-HD-LR) can be operated from 40 K to 300
K with gains in the range to and noise rates on the order of a
few Hz/mm
SiPM-matrix readout of two-phase argon detectors using electroluminescence in the visible and near infrared range
Proportional electroluminescence (EL) in noble gases is used in two-phase detectors for dark matter searches to record (in the gas phase) the ionization signal induced by particle scattering in the liquid phase. The “standard” EL mechanism is considered to be due to noble gas excimer emission in the vacuum ultraviolet (VUV). In addition, there are two alternative mechanisms, producing light in the visible and near infrared (NIR) ranges. The first is due to bremsstrahlung of electrons scattered on neutral atoms (“neutral bremsstrahlung”, NBrS). The second, responsible for electron avalanche scintillation in the NIR at higher electric fields, is due to transitions between excited atomic states. In this work, we have for the first time demonstrated two alternative techniques of the optical readout of two-phase argon detectors, in the visible and NIR range, using a silicon photomultiplier matrix and electroluminescence due to either neutral bremsstrahlung or avalanche scintillation. The amplitude yield and position resolution were measured for these readout techniques, which allowed to assess the detection threshold for electron and nuclear recoils in two-phase argon detectors for dark matter searches. To the best of our knowledge, this is the first practical application of the NBrS effect in detection science
DarkSide-20k: A 20 tonne two-phase LAr TPC for direct dark matter detection at LNGS
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