Abstract
Resistive Plate Counters (RPC) detectors at the Large Hadron Collider (LHC) experiments use gas recirculation systems to cope with large gas mixture volumes and costs. In this paper a long-term systematic study about gas purifiers, gas contaminants and detector performance is discussed. The study aims at measuring the lifetime of purifiers with new and used cartridge material along with contaminants release in the gas system. During the data-taking the response of several RPC double-gap detectors was monitored in order to characterize the correlation between dark currents, filter status and gas contaminants.
Highlights
Al2O3 g r a p h gas input particulate filter (0.20 um) and 50% Cu filter type R3-11G (BASF) while the third purifier consists of NiAlO3 filter type 6525 (LEUNA[11])
Chemical analysis setup Chemical analyses have been performed in order to correlate the increase of dark currents with the release of gas contaminants
To measure the fluorine production, sampling point HV61 and HV62 are equipped with two additional flaks and fluoride selective electrodes
Summary
50% Cu filter type R3-11G (BASF) while the third purifier consists of NiAlO3 filter type 6525 (LEUNA[11]). Before and after each filter of the closed loop, allow chemical and gaschromatograph (GC) analysis[7]. 3. Chemical analysis setup Chemical analyses have been performed in order to correlate the increase of dark currents with the. To identify the contaminants nature, the gas is sampled before and after each purifier, and bubbled into a set of PVC (Polyvinyl chloride) flasks (Fig. 6)
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