Abstract

Results from the gas gain monitoring (GGM) system for the muon detector using RPC in the CMS experiment at the LHC is presented. The system is designed to provide fast and accurate determination of any shift in the working point of the chambers due to gas mixture changes.

Highlights

  • Resistive Plate Chambers (RPC) detectors are widely used in HEP experiments for muon detection and triggering at high-energy, high-luminosity hadron colliders, in astroparticle physics experiments for the detection of extended air showers, as well as in medical and imaging applications

  • At the LHC, muon systems of the CMS experiment rely on Drift Tubes (DT), Cathode Strip Chambers (CSC) and RPCs for their muon trigger system, with a total gas volume of about 50 m3

  • A monitoring system of the RPC working point due to changes of gas composition and pollution must provide a faster and sensitive response than the CMS RPC system itself in order to avoid irreversible damage of the whole system. Such a Gas Gain Monitoring system monitors efficiency and signal charge continuously by means of a cosmic ray telescope based on RPC detectors

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Summary

LABORATORI NAZIONALI DI FRASCATI

SENSITIVITY AND ENVIRONMENTAL RESPONSE OF THE CMS RPC GAS GAIN MONITORING SYSTEM. 1) INFN Laboratori Nazionali di Frascati, Via E. 2) Universitadegli Studi di Roma ”La Sapienza”, Piazzale A. 4) INFN Sezione di Bari, Via Amendola, 173I-70126 Bari, Italy. 5) Dipartimento Interateneo di Fisica, Via Amendola, 173I-70126 Bari, Italy. 7) INFN Sezione di Napoli, Complesso Universitario di Monte Sant’Angelo, edificio 6, 80126 Napoli, Italy. 8) Universitadi Napoli Federico II, Complesso Universitario di Monte Sant’Angelo, edificio 6, 80126 Napoli, Italy. 9) INFN Sezione di Pavia, Via Bassi 6, 27100 Pavia, Italy and Universitadegli studi di Pavia, Via Bassi 6, 27100 Pavia, Italy Box 20 FI-538 1 Lappeenranta, Finland. 7) INFN Sezione di Napoli, Complesso Universitario di Monte Sant’Angelo, edificio 6, 80126 Napoli, Italy. 8) Universitadi Napoli Federico II, Complesso Universitario di Monte Sant’Angelo, edificio 6, 80126 Napoli, Italy. 9) INFN Sezione di Pavia, Via Bassi 6, 27100 Pavia, Italy and Universitadegli studi di Pavia, Via Bassi 6, 27100 Pavia, Italy

Introduction
The Gas Gain Monitoring System
Response of GGM to environmental effects
Conclusions

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