Stability and detection performance of a GEM-based Optical Readout TPC with He/CF${}_4$ gas mixtures

Abstract

The performance and long term stability of an optically readout Time Projection Chamber with an electron amplification structure based on three Gas Electron Multipliers was studied. He/CF${}_4$ based gas mixtures were used in two different proportions (60/40 and 70/30) in a CYGNO prototype with 7 litres sensitive volume. With electrical configurations providing very similar electron gains, an almost full detection efficiency in the whole detector volume was found with both mixtures, while a light yield about 20\% larger for the 60/40 was found. The electrostatic stability was tested by monitoring voltages and currents during 25 days. The detector worked in very stable and safe condition for the whole period. In the presence of less CF${}_4$, a larger probability of unstable events was clearly detected.

References in corpus (3)

• Direct observation of avalanche scintillations in a THGEM-based two-phase Ar avalanche detector using Geiger-mode APD
• Combined readout of a triple-GEM detector
• Performance of Optically Readout GEM-based TPC with a 55Fe source

Cited by in corpus (9)

• The CYGNO Experiment
• The MIGDAL experiment: Measuring a rare atomic process to aid the search for dark matter
• Review on dark matter searches
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• Discovering supernova-produced dark matter with directional detectors
• Observation of strong wavelength-shifting in the argon-tetrafluoromethane system
• The role of small scale experiments in the direct detection of dark matter
• Bayesian network 3D event reconstruction in the Cygno optical TPC for dark matter direct detection