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

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arxiv 2007.00608 v3 pith:N7B3PMCH submitted 2020-07-01 physics.ins-det hep-ex

E. Baracchini , L. Benussi , S. Bianco , C. Capoccia , M. Caponero , G. Cavoto , A. Cortez , I. A. Costa
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E. Di Marco G. D'Imperio G. Dho F. Iacoangeli G. Maccarrone M. Marafini G. Mazzitelli A. Messina R. A. Nobrega A. Orlandi E. Paoletti L. Passamonti F. Petrucci D. Piccolo D. Pierluigi D. Pinci F. Renga F. Rosatelli A. Russo G. Saviano S. Tomassini
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classification physics.ins-dethep-ex
keywords electronmixturesstabilitydetectiondetectorfoundlargerperformance
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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.

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Cited by 1 Pith paper

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  1. Simulation of the CYGNO Gaseous TPC Optical Readout

    physics.ins-det 2026-01 unverdicted novelty 5.0 of 10

    The authors developed and validated a simulation of the CYGNO optical TPC detector response using data from the LIME prototype.

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