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Optimization of CF4 recuperation from the gas mixture used in the CSC gas system at the Compact Muon Solenoid (CMS) at CERN
The Compact Muon Solenoid (CMS) is one of the four Experiments operating at the Large Hadron Collider (LHC) at CERN. Since Muons represent a very clean probe for many events of interest, the Muon detection system has a fundamental importance for identification and a detailed characterization of p...
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Lenguaje: | eng |
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2021
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Acceso en línea: | http://cds.cern.ch/record/2790110 |
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author | Arena, Maria Cristina |
author_facet | Arena, Maria Cristina |
author_sort | Arena, Maria Cristina |
collection | CERN |
description | The Compact Muon Solenoid (CMS) is one of the four Experiments operating at the Large Hadron Collider (LHC) at CERN. Since Muons represent a very clean probe for many events of interest, the Muon detection system has a fundamental importance for identification and a detailed characterization of particles collision in LHC Experiments. Each muon station consists of several layers of aluminum drift tubes (DT) in the barrel region and cathode strip chambers (CSC) in the endcap region, complemented by resistive plate chambers (RPC), both in barrel and endcap region. The Muon detector system is based on gaseous detectors, which works through the gas ionization. The main component of gas detectors is the gas mixture that must be correct and stable for the properly functioning of systems and the use of expensive and greenhouse gases cannot be avoided because of physic requirements that impose certain choices on the gas mixture composition. Therefore, the aim of this thesis consists in a detailed study of the CF4 recuperation system, used for the CMS CSC detector (that operates with a gas mixture of Ar/CO2/CF4 40/50/10), with the final goal of optimizing its economic and environmental efficiency. Based on warm separation process, the recovery system includes membranes and adsorption modules for CO2 and CF4 and an efficient CO2 removal is mandatory to reach a good CF4 adsorption capacity. The CF4 Membrane Module and the CF4 Absorber Module were studied and optimized in the light of gas chromatography measurements. The effects of experimental parameters affecting the overall functioning of the modules, such as the input flow stream and gas pressure, have been investigated. In the light of the experimental evidence reported in this Thesis, the new membrane module setup and CF4 absorber configuration ensure a remarkable increase of the average weekly efficiency from ~45% in the period November 2020-January 2021 to ~66% in the period February-June 2021. |
id | cern-2790110 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2021 |
record_format | invenio |
spelling | cern-27901102021-11-11T23:01:56Zhttp://cds.cern.ch/record/2790110engArena, Maria CristinaOptimization of CF4 recuperation from the gas mixture used in the CSC gas system at the Compact Muon Solenoid (CMS) at CERNChemical Physics and ChemistryDetectors and Experimental TechniquesThe Compact Muon Solenoid (CMS) is one of the four Experiments operating at the Large Hadron Collider (LHC) at CERN. Since Muons represent a very clean probe for many events of interest, the Muon detection system has a fundamental importance for identification and a detailed characterization of particles collision in LHC Experiments. Each muon station consists of several layers of aluminum drift tubes (DT) in the barrel region and cathode strip chambers (CSC) in the endcap region, complemented by resistive plate chambers (RPC), both in barrel and endcap region. The Muon detector system is based on gaseous detectors, which works through the gas ionization. The main component of gas detectors is the gas mixture that must be correct and stable for the properly functioning of systems and the use of expensive and greenhouse gases cannot be avoided because of physic requirements that impose certain choices on the gas mixture composition. Therefore, the aim of this thesis consists in a detailed study of the CF4 recuperation system, used for the CMS CSC detector (that operates with a gas mixture of Ar/CO2/CF4 40/50/10), with the final goal of optimizing its economic and environmental efficiency. Based on warm separation process, the recovery system includes membranes and adsorption modules for CO2 and CF4 and an efficient CO2 removal is mandatory to reach a good CF4 adsorption capacity. The CF4 Membrane Module and the CF4 Absorber Module were studied and optimized in the light of gas chromatography measurements. The effects of experimental parameters affecting the overall functioning of the modules, such as the input flow stream and gas pressure, have been investigated. In the light of the experimental evidence reported in this Thesis, the new membrane module setup and CF4 absorber configuration ensure a remarkable increase of the average weekly efficiency from ~45% in the period November 2020-January 2021 to ~66% in the period February-June 2021.CERN-THESIS-2021-189oai:cds.cern.ch:27901102021-11-09T16:23:59Z |
spellingShingle | Chemical Physics and Chemistry Detectors and Experimental Techniques Arena, Maria Cristina Optimization of CF4 recuperation from the gas mixture used in the CSC gas system at the Compact Muon Solenoid (CMS) at CERN |
title | Optimization of CF4 recuperation from the gas mixture used in the CSC gas system at the Compact Muon Solenoid (CMS) at CERN |
title_full | Optimization of CF4 recuperation from the gas mixture used in the CSC gas system at the Compact Muon Solenoid (CMS) at CERN |
title_fullStr | Optimization of CF4 recuperation from the gas mixture used in the CSC gas system at the Compact Muon Solenoid (CMS) at CERN |
title_full_unstemmed | Optimization of CF4 recuperation from the gas mixture used in the CSC gas system at the Compact Muon Solenoid (CMS) at CERN |
title_short | Optimization of CF4 recuperation from the gas mixture used in the CSC gas system at the Compact Muon Solenoid (CMS) at CERN |
title_sort | optimization of cf4 recuperation from the gas mixture used in the csc gas system at the compact muon solenoid (cms) at cern |
topic | Chemical Physics and Chemistry Detectors and Experimental Techniques |
url | http://cds.cern.ch/record/2790110 |
work_keys_str_mv | AT arenamariacristina optimizationofcf4recuperationfromthegasmixtureusedinthecscgassystematthecompactmuonsolenoidcmsatcern |