Performance of Optically Readout GEM-based TPC with a 55Fe source

Abstract

Optical readout of large Time Projection Chambers (TPCs) with multiple Gas Electron Multipliers (GEMs) amplification stages has shown to provide very interesting performances for high energy particle tracking. Proposed applications for low-energy and rare event studies, such as Dark Matter search, ask for demanding performance in the keV energy range. The performance of such a readout was studied in details as a function of the electric field configuration and GEM gain by using a ${}^{55}$Fe source within a 7 litre sensitive volume detector developed as a part of the R\&D for the CYGNUS project. Results reported in this paper show that the low noise level of the sensor allows to operate with a 2~keV threshold while keeping a rate of fake-events lesser than 10 per year. In this configuration, a detection efficiency well above 95\% along with an energy resolution ($\sigma$) of 18\% is obtained for the 5.9 keV photons, demonstrating the very promising capabilities of this technique.

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Cited by in corpus (14)

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• Stability and detection performance of a GEM-based Optical Readout TPC with He/CF${}_4$ gas mixtures
• Performance of an optically read out time projection chamber with ultra-relativistic electrons
• Imaging ${}^{55}$Fe Electron Tracks in a GEM-based TPC Using a CCD Readout
• First evidence of luminescence in a He/CF${}_4$ gas mixture induced by non-ionizing electrons
• The role of small scale experiments in the direct detection of dark matter
• Enhancing the light yield of He:CF${}_4$ based gaseous detector
• Bayesian network 3D event reconstruction in the Cygno optical TPC for dark matter direct detection
• Small scale direct dark matter search experiments
• A 1 m${}^3$ Gas Time Projection Chamber with Optical Readout for Directional Dark Matter Searches: the CYGNO Experiment