| Article | |
| Report number | arXiv:2209.02020 |
| Title | Searching for an eco-friendly gas mixture for the ALICE Resistive Plate Chambers |
| Author(s) |
Cardarelli, R. (INFN, Rome2) ; Alberghi, G. (INFN, Bologna) ; Abbrescia, Marcello (INFN, Bari) ; Aielli, Giulio (Rome U., Tor Vergata) ; Aly, Reham (INFN, Bari ; Helwan U.) ; Arena, Maria Cristina (Pavia U.) ; Barroso, Mapse - (Rio de Janeiro State U.) ; Benussi, Luigi (Frascati) ; Bianco, Stefano (Frascati) ; Boscherini, Davide (INFN, Bologna) ; Bruni, Alessia (INFN, Bologna) ; Camarri, Paolo (Rome U., Tor Vergata) ; Congedo, Liliana (INFN, Bari) ; Corbetta, Mara (CERN) ; De Serio, Marilisa (INFN, Bari) ; Di Ciaccco, Anna (Rome U., Tor Vergata) ; Di Stante, Luigi (Rome U., Tor Vergata) ; Dupieux, Pascal (LPC, Clermont-Ferrand) ; Eysermans, Jan (MIT) ; Ferretti, Alessandro (INFN, Turin) ; Gagliardi, Martino (INFN, Turin) ; Galati, Giuliana (INFN, Bari) ; Guida, Robero (CERN) ; Joly, Baptiste (LPC, Clermont-Ferrand) ; Liberti, Barbara (INFN, Rome2) ; MANDELLI, Beatrice (CERN) ; Manen, Samuel Pierre (LPC, Clermont-Ferrand) ; Massa, Lorenzo (INFN, Bologna) ; Passamonti, Luciano (Frascati) ; Pastore, Alessandra (INFN, Bari) ; Pastori, Enrico (INFN, Rome2) ; Piccolo, Davide (Frascati) ; Pierluigi, Daniele (Frascati) ; Pizzimento, Luca ; Polini, Alessandro (INFN, Bologna) ; Proto, Giorgia (INFN, Rome2) ; Pugliese, Gabriella (INFN, Bari) ; Quaglia, Luca (Turin U.) ; Ramos, Dayron ; Rigoletti, Gianluca (CERN) ; Rocchi, Alessandro ; Romano, Marino (INFN, Bologna) ; Ferrini, A. Russo M. (Frascati) ; Salvini, Paola (INFN, Pavia) ; Samalan, Amrutha (Gent U.) ; Santonico, Rinaldo (Rome U., Tor Vergata) ; Saviano, Giovanna (INFN, Bari) ; Simone, Saverio (INFN, Bari) ; Terlizzi, Livia (INFN, Turin) ; Tytgat, Michael (Gent U.) ; Vercellin, Ermanno (INFN, Turin) ; Verzeroli, Mattia (Pavia U.) ; Zaganidis, Nikolaos (Gent U.) |
| Publication | 2023-03-27 |
| Imprint | 2022-09-05 |
| Number of pages | 6 |
| In: | PoS LHCP2022 (2023) 260 |
| In: | 10th Annual Large Hadron Collider Physics (LHCP2022), Online, 16 - 20 May 2022, pp.260 |
| DOI | 10.22323/1.422.0260 |
| Subject category | hep-ex ; Particle Physics - Experiment ; physics.ins-det ; Detectors and Experimental Techniques |
| Accelerator/Facility, Experiment | CERN LHC ; ALICE |
| Abstract | The ALICE RPCs are operated with a mixture of 89.7% $C_{2}H_{2}F_{4}$, 10% i-$C_{4}H_{10}$ and 0.3% $SF_{6}$. $C_{2}H_{2}F_{4}$ and $SF_{6}$ are fluorinated greenhouse gases with a high Global Warming Potential (GWP). New European Union regulations have imposed a progressive phase-down of the production and usage of F-gases, aiming to cut down their emission by two thirds in 2030 with respect to 2014. Even though research activities are excluded from these regulations, the phase-down will inevitably increase their price and CERN is also aiming to cut down on its emissions. For these reasons it is crucial to find a more eco-friendly gas mixture for RPCs by the time of the LHC long shutdown 3, foreseen in 2026. Since $C_{2}H_{2}F_{4}$ is the main contributor to the mixture GWP, an extensive R&D process has started to replace it with tetrafluoropropene ($C_{3}H_{2}F_{4}$), due to its chemical similarity with $C_{2}H_{2}F_{4}$ and its low GWP (around 7). Preliminary tests with cosmic rays have shown promising results in terms of detector performance. The next step is to study the long-term behavior of RPCs operated with these new gas mixtures (aging studies). Since this is a subject of interest for all (and not only) the LHC experiments, a collaboration, ECOgas@GIF++, was setup to carry out joint studies. Among others, a small ALICE-like RPC was installed at the Gamma Irradiation Facility at CERN, where they are exposed to a strong radiation field, coming from a 12.5 TBq $^{137}$Cs source, which allows one to simulate many years of operation in a relatively short time. The facility also provides a muon beam at specific times of the year, which can be used to study the detector performance (e.g. efficiency and cluster size) during and after irradiation. |
| Copyright/License | publication: © 2023-2024 The author(s) (License: CC-BY-NC-ND-4.0) preprint: (License: CC BY 4.0) |
Corresponding record in: Inspire
Záznam vytvorený 2022-09-08, zmenený 2023-11-23