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Ecological transition for the gas mixtures of the MRPC cosmic ray telescopes of the EEE Project

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arxiv 2309.17375 v1 pith:BEBYRAZS submitted 2023-09-29 hep-ex physics.ins-det

Ecological transition for the gas mixtures of the MRPC cosmic ray telescopes of the EEE Project

classification hep-ex physics.ins-det
keywords mixtureecologicalalternativechambersmixturestelescopetelescopestransition
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The Extreme Energy Events (EEE) Collaboration is fully involved in an ecological transition. The use of the standard gas mixture, \ce{C_{2}H_{2}F_{4}}+ \ce{SF_{6}}, has stopped in favor of an alternative green mixture based on \ce{C_{3}H_{2}F_{4}} with the addition of He or \ce{CO_{2}}. The choise of these new mixtures is motivated by the significant lower Global Warming Potential (GWP) to reduce the emission of gases potentially contributing to the greenhouse effect. The EEE experiment consists of 61 muon telescopes based on Multigap Resistive Plate Chambers (MRPCs), each telescope composed of 3 chambers filled with gas. Several EEE detectors are today completely fluxed with the new ecological mixture. This contribution will report recent results about the telescope performance obtained from studies with the eco-friendly alternative mixture carried out in the last years.

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