The Extreme Energy Events observatory is an extended muon telescope array, covering more than 10 degrees both in latitude and longitude. Its 59 muon telescopes are equipped with tracking detectors based on Multigap Resistive Plate Chamber technology with time resolution of the order of a few hundred picoseconds. The recent restrictions on greenhouse gases demand studies for new gas mixtures in compliance with the relative requirements. Tetrafluoropropene is one of the candidates for tetrafluoroethane substitution, since it is characterized by a Global Warming Potential around 300 times lower than the gas mixtures used up to now. Several mixtures have been tested, measuring efficiency curves, charge distributions, streamer fractions and time resolutions. Results are presented for the whole set of mixtures and operating conditions, focusing on identifying a mixture with good performance at the low rates typical of an EEE telescope.
1.Museo Storico Fis, Rome, Italy 2.Ctr Studi & Ric Enrico Fermi, Rome, Italy 3.Univ Bari, INFN, Bari, Italy 4.Univ Bari, Dipartimento Interateneo Fis, Bari, Italy 5.Univ Pisa, INFN, Pisa, Italy 6.Univ Pisa, Dipartimento Fis, Pisa, Italy 7.INFN, Lab Nazl Frascati, Frascati, RM, Italy 8.Univ Siena, INFN, Grp Coll Siena, Siena, Italy 9.Univ Siena, Dipartimento Fis, Siena, Italy 10.Univ Bologna, INFN, Bologna, Italy 11.Univ Bologna, Dipartimento Fis & Astron, Bologna, Italy 12.Univ Torino, INFN, Turin, Italy 13.Univ Torino, Dipartimento Fis, Turin, Italy 14.Univ Cagliari, INFN, Cagliari, Italy 15.Univ Cagliari, Dipartimento Fis, Cagliari, Italy 16.Univ Roma Tor Vergata, INFN, Rome, Italy 17.Univ Roma Tor Vergata, Dipartimento Fis, Rome, Italy 18.Univ Salento, INFN, Lecce, Italy 19.Univ Salento, Dipartimento Matemat & Fis, Lecce, Italy 20.Univ Salerno, INFN, Salerno, Italy 21.Univ Salerno, Dipartimento Fis, Salerno, Italy 22.INFN, Lab Nazl Gran Sasso, Assergi, AQ, Italy 23.INFN, CNAF, Bologna, Italy 24.ICSC World Lab, Geneva, Switzerland 25.CERN, Geneva, Switzerland 26.JINR, Dubna, Russia 27.Univ Genoa, INFN, Genoa, Italy 28.Univ Genoa, Dipartimento Fis, Genoa, Italy 29.Univ Catania, INFN, Catania, Italy 30.Univ Catania, Dipartimento Fis & Astron, Catania, Italy 31.Univ Messina, INFN, Sez Catania, Messina, Italy 32.Univ Messina, Dipartimento Sci Chim Biol Farmaceut & Ambientali, Messina, Italy 33.INFN, Sez Bari, Bari, Italy 34.Trento Inst Fundamental Phys & Applicat, Trento, Italy 35.Univ Calabria, INFN, Cosenza, Italy 36.Univ Calabria, Dipartimento Fis, Cosenza, Italy 37.Univ Messina, Dipartimento Sci Matemat & Informat, Sci Fis & Sci Terra, Messina, Italy
Recommended Citation:
Pisano, S.,Abbrescia, M.,Avanzini, C.,et al. New Eco-gas mixtures for the Extreme Energy Events MRPCs: results and plans[J]. JOURNAL OF INSTRUMENTATION,2019-01-01,14